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
- Acne treatmentHow to get rid of acne and pimples, from store products to scars and seeing a dermatologist.
- Acne typesEvery type of acne spot, the look-alikes, and acne on the back, chest and face.
- Dark spotsAcne marks, sun spots and melasma: what causes them and what fades them.
- EczemaWhat eczema is, what it looks like, what causes it, and what a doctor may offer.
- Ingredient pairingWhich skincare ingredients you can mix, pair by pair, with the source for each answer.
- NiacinamideWhat niacinamide does, how strong the proof is, and how to use it safely.
- Retinoids for acneRetinol, adapalene, tretinoin and other retinoids compared, with directions, side effects and safety, all from named medical sources.
- RosaceaWhat rosacea is, how a doctor confirms it, and the daily care that helps.
- Salicylic acidWhat salicylic acid does, which acne it fits, how to use it, and when to be careful.
- Skin typesFind your skin type, then care for oily, dry, combination or sensitive skin.
- Skincare routineHow to start a routine, the order of each step, and which products you need.
- SunscreenWhat to look for on a sunscreen label, how to use it, and what the FDA and AAD say.
- The complete acne skincare routineEvery step, every ingredient strength, and how long to wait, in one guide.
September 25, 2026
Acne on darker skin: care that avoids dark marks
Acne on brown and black skin often leaves dark spots, so treat it early and gently. What works, which products to avoid, and when to see a dermatologist.
Read the guide- 02
September 25, 2026
Acne serums: how to read the label first
An acne serum is a format, and the active ingredient decides what it does. How to check the Drug Facts box, when to apply a serum, and what to avoid mixing.
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September 25, 2026
Acne spot treatment: when dabbing one pimple helps
What an acne spot treatment can and cannot do, which ingredients work on a single pimple, why the labels ask for the whole area, and how to avoid irritation.
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September 25, 2026
Adapalene for blackheads and whiteheads
The AAD recommends a retinoid to unclog blackheads and whiteheads and names adapalene as the one you can buy. Here is what the sources say about using it.
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September 25, 2026
Adapalene vs tretinoin for acne: what differs
Both are topical retinoids approved for acne. Adapalene 0.1 percent gel is over the counter and tretinoin needs a prescription. Here is how the labels compare.
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September 25, 2026
Adult acne: causes and what helps
Why adults in their 20s to 50s still get acne, the common causes the AAD lists, the treatments that fit adult skin, and when to see a dermatologist.
Every guide, by topic
Acne treatment
- 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
Acne types
- 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
Dark spots
- 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?
Eczema
- 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
Ingredient pairing
- 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?
Niacinamide
- 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
Retinoids for acne
- 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
Rosacea
- 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
Salicylic acid
- 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
Skin types
- 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
- Sensitive skin: signs, triggers and gentle care
- 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
Skincare routine
- 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
Sunscreen
- 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
The complete acne skincare routine
- What order to apply your acne products, morning and night
- How to start an acne routine with three products
- How long does an acne routine take to work?
- How to patch test a new skincare product before your whole face
- Salicylic acid vs benzoyl peroxide: which one to start with
- Skin purging vs a real breakout: how to tell the difference
- How to start adapalene without irritation
- Hormonal acne vs regular acne: how to tell which one you have
- Does diet cause acne? What dairy and sugar do
- How to take acne progress photos that actually show change
- How accurate are AI acne scanner apps?
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.