Skin and acne guides
Plain guides on acne, skincare routines, ingredients, sunscreen, dark spots, rosacea and eczema, each with its sources.
Start with a full guide
- The complete acne skincare routineEvery step, every ingredient strength, and how long to wait, in one guide.
- Acne treatmentHow to get rid of acne and pimples, from store products to scars and seeing a dermatologist.
- Hormonal and adult acneHormonal acne in women and men: jawline and period flares, PCOS, spironolactone, birth control, supplements, pregnancy and menopause.
- Acne typesEvery type of acne spot, the look-alikes, and acne on the back, chest and face.
- Acne by face areaWhat acne on the cheeks, mouth, nose, eyelids, hairline, ears and neck can point to, look-alike rashes, and when to see a doctor.
- Body acneAcne on the back, chest, shoulders, neck, arms and thighs: body washes and sprays, causes such as sweat and straps, and look-alikes such as folliculitis.
- Blackheads and whiteheadsWhy blackheads and whiteheads form, what clears them at home, and when a dermatologist can help.
- Spot careWhat to do about one pimple: the risks of popping, pimple patches, warm and cold compresses, and bumps that may be something else.
- Acne scarsTypes of acne scars, which ones fade, and how lasers, microneedling, peels, subcision, fillers and creams compare.
- Diet and acneWhat milk, sugar, chocolate and supplements do to acne, study by study.
- Daily habits and acneWhich everyday habits worsen acne, which get blamed without evidence, and what to change first.
- Home remedies for acneWhat the evidence says about honey, aloe, baking soda, oils and medicine cabinet items on acne, and which store ingredients are supported.
- Retinoids for acneRetinol, adapalene, tretinoin and other retinoids compared, with directions, side effects and safety, all from named medical sources.
- TretinoinHow tretinoin works, how to use it, results, side effects and what to use with it, from the drug labels and dermatologists.
- Benzoyl peroxideWhat benzoyl peroxide does for acne, which strength and form to choose, how to use it, and what to know about side effects and safety.
- Salicylic acidWhat salicylic acid does, which acne it fits, how to use it, and when to be careful.
- Azelaic acidWhat azelaic acid does, what the prescription labels approve it for, and how it is used for acne, rosacea and marks.
- Accutane (isotretinoin)What isotretinoin is, how it works, the iPLEDGE rules, the side effects and the results, from the FDA label and dermatologists.
- Dark spotsAcne marks, sun spots and melasma: what causes them and what fades them.
- Skincare routineHow to start a routine, the order of each step, and which products you need.
- NiacinamideWhat niacinamide does, how strong the proof is, and how to use it safely.
- Ingredient pairingWhich skincare ingredients you can mix, pair by pair, with the source for each answer.
- Skin typesFind your skin type, then care for oily, dry or combination skin.
- Sensitive skinSigns and triggers of sensitive skin, label words, and gentle face wash, moisturizer, sunscreen, shaving, actives and makeup.
- Skin barrier and using too muchSigns of a damaged skin barrier, over-exfoliation, stinging, gentle cleansers and moisturizers, and purging from tretinoin and other acne treatments.
- MiliaWhat milia are, why they form, how doctors remove them, milia near the eyes and in babies, and the bumps that look like milia.
- SunscreenWhat to look for on a sunscreen label, how to use it, and what the FDA and AAD say.
- RosaceaWhat rosacea is, how a doctor confirms it, and the daily care that helps.
- EczemaWhat eczema is, what it looks like, what causes it, and what a doctor may offer.
Humidifiers and skin: what they do and do not fix
Dermatology sources recommend a humidifier for dry indoor air, not as an acne treatment. What it changes, what it cannot do, and how to run one safely.
Read the guide- 02
Coffee and acne: what the studies measured
No trial has tested coffee for acne. Surveys link coffee drinkers to more spots, but the milk and sugar in the cup are the parts with real evidence behind them.
- 03
Creatine and acne: what the research shows
No study has found that creatine causes acne. Here is where the worry started, what the hormone trials measured, and what to check if your skin changed.
- 04
Travel acne: why skin breaks out on trips
Travel is not a listed cause of acne. What the FAA measured about cabin humidity, which travel habits appear on the AAD's own list, and what to pack.
- 05
Hard water and acne: what the evidence says
No guideline lists hard water as a cause of acne. The real evidence is about eczema in children, and even there softeners did not help. What that means for you.
- 06
LED light therapy for acne: blue, red and masks
Blue and red LED light can treat pimples, and the AAD says it does not work on blackheads, whiteheads or cysts. Rarely does light alone clear acne.
Every guide, by topic
- What order to apply acne products, day and night
- How to start an acne routine with three products
- How long does an acne routine take to work?
- How to patch test skincare before using it
- Salicylic acid vs benzoyl peroxide for acne
- Skin purging vs breakout: how to tell them apart
- How to start adapalene without irritation
- Hormonal acne vs regular acne: signs to look for
- Does diet cause acne? What dairy and sugar do
- How to take acne progress photos that show change
- How accurate are AI acne scanner apps?
- Best acne treatments, according to the guidelines
- Over-the-counter acne treatments: what to buy
- Acne serums: how to read the label first
- How to get rid of acne naturally: the evidence
- How to get rid of acne fast: realistic timelines
- How to get rid of pimples without popping them
- Acne spot treatment: when dabbing one pimple helps
- Pimple patches: what they do and when they help
- Can you get rid of a pimple overnight?
- Severe acne: when to see a dermatologist
- Adult acne: causes and what helps
- How to get rid of acne scars: what works
- Doxycycline for acne: how it works and how long
- Sulfur for acne: what it does and how to use it
- LED light therapy for acne: blue, red and masks
- Jawline acne: causes and what helps
- Period acne: why it happens and how to prevent it
- PCOS acne: signs, causes and treatment
- Hormonal acne in men: causes and treatment
- Spironolactone for acne: uses and side effects
- Birth control for acne: which pills help and how
- Natural remedies for hormonal acne: what works
- Supplements for hormonal acne: the evidence
- Pregnancy acne: causes, timing and safe care
- Menopause acne: causes and treatment
- When does hormonal acne stop? Ages and timelines
- Can stress cause acne? Stress vs hormonal acne
- Chin acne in adults: causes and what helps
- DHT and acne: does hair loss treatment affect skin
- Spironolactone vs birth control for hormonal acne
- What is acne? How a pimple forms
- What causes acne, and what makes it worse
- Blackheads vs whiteheads: what is the difference
- Cystic acne: what it is, causes and treatment
- Fungal acne: what it is and how doctors treat it
- How to get rid of back acne, step by step
- How to get rid of chest acne
- Butt acne: what causes it and what helps
- Pimple on lip or cold sore? How to tell
- Pimple on nose: causes and what to do
- Forehead and chin acne: common causes
- Keratosis pilaris vs acne: how to tell them apart
- Acne on cheeks: causes, hormones and treatment
- Acne around the mouth: causes and treatment
- Perioral dermatitis: signs, causes and treatment
- Pimple inside the nose: causes and warning signs
- Pimple on eyelid: stye, chalazion or milia?
- Hairline acne: causes, pomade acne and treatment
- Pimple in ear: causes, ear lobe bumps and care
- Neck acne: causes, look-alikes and treatment
- Pimples on eyebrows: causes and look-alike bumps
- Acne on one side of the face: causes and care
- Pimple on your lip line: what it is
- Pimple inside your lip: what it is
- Pimple on your temple: causes
- Acne body wash: benzoyl peroxide or salicylic acid
- Body acne spray: does it work and how to use it
- Shoulder acne: what causes it and how to treat it
- Acne on the back of the neck: causes and treatment
- Cystic acne on the back: causes and treatment
- Acne on arms and thighs, and inner thigh blackheads
- Does sweat cause acne? Sweat and body acne
- Acne mechanica: backpacks, straps and tight clothes
- Can shampoo and conditioner cause back acne?
- Folliculitis or acne? How to tell body bumps apart
- Scalp acne: pimples, blackheads and whiteheads
- What causes blackheads, and how to stop new ones
- Closed comedones: causes and how to clear them
- How to get rid of blackheads on your nose
- Whiteheads on your nose: causes and treatment
- Blackheads in your ear: causes and safe care
- Blackheads on your back: why and what helps
- How to get rid of whiteheads without picking
- Pore strips for blackheads: do nose strips work?
- Comedone extractors for whiteheads: are they safe?
- How a dermatologist removes blackheads
- Face masks for blackheads: peel-off, clay, charcoal
- Blind pimple: what it is and how to treat it
- Warm compress for a pimple, including on the lip
- Ice on a pimple: does it help?
- What to do after popping a pimple
- How long to leave a pimple patch on
- Microneedle pimple patches: do they work?
- Do pimple patches work on blackheads?
- DIY pimple patch: what works and what to skip
- Can you put a pimple patch on a cold sore?
- Pimple on tongue: what it is and how to treat it
- Tea tree oil for acne: does it help pimples?
- Types of acne scars: ice pick, boxcar, rolling
- Are acne scars permanent? What fades, what stays
- Raised acne scars: hypertrophic scars and keloids
- Back acne scars: how to get rid of them
- Laser treatment for acne scars: results and risks
- Microneedling for acne scars: what to expect
- Chemical peels for acne scars: which peel, risks
- Subcision for acne scars: how it works, results
- Dermal fillers for acne scars: types and risks
- Does tretinoin help acne scars? What studies show
- Home remedies for acne scars: what evidence shows
- Milk and acne: skim, whole and what studies show
- Whey protein and acne: shakes, isolate, back acne
- High glycemic foods and acne: what trials show
- Chocolate and acne: cocoa, sugar and the trials
- Greasy food and acne: fried food, fast food, grease
- Gluten and acne: does going gluten-free help?
- Alcohol and acne: drinking, antibiotics, skin
- Zinc for acne: dose, type, timing and safety
- Vitamin A and acne: doses, safety and pregnancy
- Fish oil and acne: omega-3 doses and evidence
- Biotin and acne: what the research shows
- Gut health and acne: what the research actually shows
- Creatine and acne: what the research shows
- Coffee and acne: what the studies measured
- Does makeup cause acne? Non-comedogenic, safe wear
- Pillowcases and acne: how often to change them
- Phone screens and acne: do screens cause breakouts
- Maskne: why masks cause breakouts and how to stop
- Beard and mustache acne: causes and treatment
- Sweat, gym gear and back acne: a workout routine
- Cold weather and acne: winter breakouts explained
- Humidity and acne: does climate make it worse
- Toner for acne-prone skin: do you need one and how
- Washing your face too often: how many times a day
- Sleep and acne: does too little sleep cause breakouts
- Smoking and acne: does smoking cause breakouts
- Humidifiers and skin: what they do and do not fix
- Honey for acne: what the one trial found
- Aloe vera for acne: what small trials found
- Turmeric for acne: studies and skin reactions
- Green tea for acne: lotion, pills and tea bags
- Garlic for acne: no trial, and a risk of burns
- Lemon juice for acne: no trial, and a sun risk
- Baking soda for acne: does it help or irritate?
- Coconut oil for acne: does it clog pores?
- Rubbing alcohol for acne: the AAD says to avoid it
- Hydrogen peroxide for acne: the cream vs the bottle
- Aspirin mask for acne: does crushed aspirin help?
- Vaseline and acne: the AAD and a review disagree
- Neosporin on a pimple: no acne use, allergy risk
- Hydrocortisone on a pimple: acne is a side effect
- Salt water for acne: no trial has tested it
- Castor oil for acne: what a 2026 review found
- Jojoba oil for acne: what one mask study found
- Rosehip oil for acne: no study in people
- Toothpaste on a pimple: why dermatologists say no
- Witch hazel for acne: what it does and its limits
- Apple cider vinegar for acne: what evidence shows
- Does retinol work for acne? What the evidence says
- Retinol vs adapalene for acne: how they differ
- Adapalene vs tretinoin for acne: what differs
- Prescription retinoids for acne: the options
- How to start retinol for acne without irritation
- Retinoid with benzoyl peroxide: can you use both?
- What to mix with a retinoid and what to keep apart
- Differin gel and adapalene: strengths and forms
- Does retinol make acne worse at first?
- Retinoid dryness and peeling: what to do
- Retinoids during pregnancy and breastfeeding
- Retinoids for teens: what the sources say
- Adapalene for blackheads and whiteheads
- What retinol does for your skin and how it works
- Retinol vs retinoid: is tretinoin a retinol?
- Retinol before and after: what to expect by week
- Moisturizer with retinol: what to use and when
- Is retinol bad for you? Side effects and safety
- How to use tretinoin: the steps on the label
- How to get tretinoin: it needs a prescription
- Tretinoin cream vs gel: what the labels show
- Does tretinoin expire? Dates and storage
- How long does tretinoin take to work? A timeline
- Tretinoin before and after: what trials found
- Tretinoin side effects: what the labels list
- What happens if you stop using tretinoin?
- Moisturizer with tretinoin: before or after?
- Gentle cleanser for tretinoin: what labels say
- Sunscreen for tretinoin users: SPF and timing
- Clindamycin and tretinoin together for acne
- Hydroquinone and tretinoin together for melasma
- Salicylic acid with tretinoin: can you use both?
- Tretinoin for wrinkles: what the label says
- Tretinoin for stretch marks: what studies show
- Tazarotene vs tretinoin for acne: how they differ
- Tretinoin vs isotretinoin (Accutane): differences
- Retin-A vs tretinoin: brand and generic compared
- Is tretinoin a steroid? Its drug class explained
- Tretinoin on a popped pimple: is it safe?
- Tretinoin under eyes: what the labels warn
- Tretinoin strengths: 0.025%, 0.05%, 0.1% compared
- Retinal vs retinol vs tretinoin: how they differ
- Benzoyl peroxide face wash: how and when to use it
- Benzoyl peroxide 2.5%, 5% or 10%: which strength?
- Benzoyl peroxide cream or gel: which to choose?
- Clindamycin and benzoyl peroxide gel: how it works
- Benzoyl peroxide and moisturizer: which goes first?
- Does benzoyl peroxide cause purging?
- Benzoyl peroxide before and after: what to expect
- Does benzoyl peroxide help acne scars?
- Benzoyl peroxide for folliculitis: does it help?
- Does benzoyl peroxide bleach skin, hair or towels?
- Is benzoyl peroxide safe? Side effects and allergy
- Can salicylic acid cause breakouts or purging?
- How to use salicylic acid on your face
- Salicylic acid for acne: what it can and can't do
- What is salicylic acid, and is it a BHA?
- Salicylic acid for blackheads: how it works
- Salicylic acid side effects: dryness to allergy
- Salicylic acid strengths and forms explained
- When to use salicylic acid: morning or night
- Salicylic acid during pregnancy: what sources say
- Salicylic acid for oily skin: does it help?
- Salicylic acid vs glycolic acid: how they differ
- Does azelaic acid help with acne? What trials show
- Azelaic acid for rosacea: what the trials show
- Azelaic acid for perioral dermatitis: the evidence
- Azelaic acid 10%, 15% or 20%: which strength?
- Azelaic acid gel, cream, foam or serum: which one?
- Is azelaic acid an exfoliant? How it differs
- Azelaic acid before and after: what to expect
- Does azelaic acid cause purging? What labels say
- Can you use azelaic acid with niacinamide?
- Azelaic acid and tretinoin: how they compare
- Is azelaic acid safe during pregnancy?
- How to get Accutane: prescriber, iPLEDGE, pharmacy
- Low dose Accutane: what the label and studies say
- How long does Accutane take to work? A timeline
- Accutane purge: why acne can flare at the start
- Accutane before and after: results and relapse
- Accutane and pregnancy: the risks and iPLEDGE rules
- Accutane side effects: common, serious and lasting
- Accutane and depression: the label and the studies
- Accutane lips: why they dry out and what helps
- Accutane hair loss and weight changes: the evidence
- Can you drink on Accutane? Alcohol and isotretinoin
- Dark marks after pimples: why they form and fade
- How long do dark marks take to fade?
- How to get rid of dark spots on your face
- Sun spots: what they are and how to fade them
- Melasma: causes, triggers and treatment
- Skin discoloration: causes and when to worry
- Dark spots on darker skin: what fades them
- When a dark spot needs a doctor
- Retinol and tretinoin for dark spots
- Azelaic acid for dark spots: what it does
- Vitamin C for dark spots: what the evidence shows
- Niacinamide for dark spots: does it help?
- Glycolic acid for acne: what it does, how to use it
- Lactic acid for acne and dark spots: how it works
- Vitamin C serum for acne scars: how and when to use
- How to build a skincare routine from scratch
- What makes a good skincare routine?
- How many skincare products do you need?
- A simple skincare routine for teens
- Skincare routine order for every skin type
- Skincare steps explained: what each one does
- Morning vs night skincare routine: what differs
- How long to wait between skincare steps
- When to use toner, and do you need one?
- When and how often to exfoliate your face
- When to use retinol in your skincare routine
- Skin cycling: the 4-night routine, and acne
- How and when to use a niacinamide serum
- Does niacinamide help with acne? The evidence
- Is niacinamide good for oily skin?
- Niacinamide for redness and sensitive skin
- Can niacinamide cause acne or purging?
- Does niacinamide shrink pores? What studies show
- Which niacinamide percentage should you use?
- Niacinamide side effects and what they mean
- Is niacinamide safe during pregnancy?
- Is niacinamide good for dry skin?
- Niacinamide vs niacin: pills, flushing and skin
- Can you use salicylic acid with retinol?
- Can you use glycolic acid with retinol?
- Can you use vitamin C with retinol?
- Can you use niacinamide with retinol?
- Can you use niacinamide with tretinoin?
- Can you use hyaluronic acid with retinol?
- Can you use azelaic acid with retinol?
- Can you use AHA and BHA together?
- Can you use salicylic acid with niacinamide?
- Can you use niacinamide with vitamin C?
- Can you use benzoyl peroxide with vitamin C?
- Why is my face so oily? Causes of oily skin
- Oily skin routine: how to control oil and shine
- Sebaceous filaments: do they mean oily skin?
- What causes dry skin, and why is yours so dry?
- How to treat dry skin on your face
- Dry, flaky patches on your face: causes and care
- Dehydrated skin vs dry skin: what the terms mean
- Can dry skin cause acne and pimples?
- Combination skin: how to care for two skin types
- Acne on darker skin: care that avoids dark marks
- How to choose a cleanser for acne-prone skin
- How to choose a moisturizer for acne-prone skin
- What non-comedogenic means on a skincare label
- Face wash for sensitive skin: what to look for
- Moisturizer for sensitive skin: types and labels
- Body wash for sensitive skin: what to look for
- Sunscreen for sensitive skin: the AAD's advice
- Shaving cream for sensitive skin and how to shave
- Retinol for sensitive skin: how to start slowly
- Vitamin C serum for sensitive skin: how to start
- Acne treatment for sensitive skin: how to start
- Exfoliator for sensitive skin: what the AAD advises
- Fragrance-free vs unscented: what labels mean
- Laundry detergent for sensitive skin: what to know
- Makeup for sensitive skin: labels, eyes, removal
- Eye cream for sensitive skin: what to look for
- How to know if you have sensitive skin
- Why is my skin suddenly sensitive?
- Skin allergy or irritation? How to tell them apart
- What hypoallergenic actually means on a label
- How to patch test skincare on sensitive skin
- Signs of a damaged skin barrier, and what causes it
- Why does my skincare sting? Causes and what to do
- Over-exfoliated skin: signs and how to fix it
- Bumps after over-exfoliating: what they are
- How to repair a damaged skin barrier, step by step
- Gentle cleansers for a damaged skin barrier
- Moisturizer for a damaged skin barrier: what to use
- Can a damaged skin barrier cause acne?
- Tretinoin purging: timeline and what helps
- How long does skin purging last? Stages and timing
- Centella asiatica (cica) for acne: what it does
- Ceramides: what they do for acne-prone skin
- Squalane and acne-prone skin: does it clog pores
- Milia removal: how doctors extract milia
- Can you pop milia? Why home removal goes wrong
- Retinol, adapalene and tretinoin for milia
- Salicylic and glycolic acid for milia
- Milia under the eyes and on the eyelids
- Milia on lips: causes, lookalikes and removal
- Baby milia: newborn white spots explained
- What causes milia? Primary and secondary causes
- Milia vs whiteheads: how to tell them apart
- White bumps on the face that are not milia
- Sunscreen for acne-prone skin: what to look for
- Mineral vs chemical sunscreen: which is better?
- What is reef safe sunscreen? What the label means
- How does sunscreen work, and what does SPF mean?
- How often to reapply sunscreen, and why
- Does sunscreen expire? How long it lasts
- Can you tan with sunscreen on? What happens
- Is sunscreen bad for you? What FDA and NCI say
- Does sunscreen block vitamin D? What studies show
- How to make natural sunscreen: why DIY is unsafe
- Do Black people need sunscreen? What the AAD says
- When can an infant wear sunscreen?
- The Fitzpatrick skin scale: the six skin types
- Rosacea symptoms: signs on the skin and eyes
- What causes rosacea? What the research shows
- Rosacea triggers: how to find and avoid yours
- Is rosacea autoimmune or contagious?
- What rosacea looks like and how it is diagnosed
- Rosacea vs acne: how to tell them apart
- How to treat rosacea: what a doctor may offer
- Can rosacea be cured or go away for good?
- Ocular rosacea: when rosacea affects the eyes
- How to calm a rosacea flare-up
- Skincare for rosacea: a gentle daily routine
- Sunscreen for rosacea: what to look for
- What causes eczema? Genes, skin and immune system
- What does eczema look like? Signs and diagnosis
- Types of eczema: atopic, contact, discoid and more
- Eczema vs dry skin: how to tell them apart
- Is eczema contagious? What can and cannot spread
- Is eczema an autoimmune disease? What research says
- How to treat eczema: what a doctor may offer
- Eczema on the face: causes and how to treat it
- Can eczema be cured permanently? What to expect
- Does eczema go away? Children and adults
- What causes eczema flare-ups? Common triggers
- Moisturizing and bathing for eczema-prone skin
More guides
- Travel acne: why skin breaks out on trips
- Hard water and acne: what the evidence says
- Double cleansing for acne: is it worth it?
- Is a sauna good for acne? Sauna and steam
- Does chlorine cause acne? Swimming and skin
- Does shaving cause acne? How to shave with it
- Do hot showers cause acne? What to know
- Does drinking water help acne? The evidence
- Can you get a pimple anywhere?
- Pimple in your armpit: causes
- Pimples on your breast: causes
Skinli gives simple tips for skin with pimples. It is not a doctor. It cannot tell you what is wrong the way a doctor can. If your pimples hurt, are deep under the skin, are getting worse, or will not go away, see a doctor.