Skin purging vs breakout: how to tell them apart

Purging and a breakout both look like new pimples after you start a product, but they behave differently. Purging is the popular name for acne that gets worse at first with a retinoid such as adapalene: the adapalene label says that "during the early weeks of use, your acne may appear to worsen before it improves (this is normal)". It shows up where you already get pimples, and it settles as you keep going. A breakout from irritation or an allergy can appear in new places, often burns, itches or swells, and keeps getting worse. The first is a reason to continue. The second is a reason to cut back or stop. For how a new product fits into a full routine, see the complete acne skincare routine.

What purging means

Acne starts in a blocked pore. The NHS says acne can happen when hair follicles become blocked with extra oil and dead skin cells.

Retinoids change how fast the outer skin renews itself. The American Academy of Dermatology (AAD) says a retinoid spurs faster turnover of surface skin cells. MedlinePlus says that during the first weeks of treatment, adapalene "may bring previously unseen pimples to the skin surface." The Retin-A tretinoin label gives the same reason for early worsening: the medicine acts on "deep, previously unseen lesions," and this "should not be considered a reason to discontinue therapy."

The adapalene label, the tretinoin label, MedlinePlus and the UK NICE acne guideline describe early worsening without using the word "purging."

Which products can make acne look worse at first

Not every product carries this warning. Here is what each source says.

• Adapalene and other retinoid creams. The adapalene label and the tretinoin label both describe worsening in the early weeks.
• Salicylic acid. MedlinePlus says "your condition may worsen during the first few days of treatment as your skin adjusts to the medication." That is days, where the adapalene label says weeks. The FDA rules for acne product labels and the NICE guideline do not call this purging. Can salicylic acid cause breakouts? covers it in detail.
• Benzoyl peroxide. The NHS says it works by reducing the bacteria on your skin. It lists hot, itchy or painful skin, redness, and dry or peeling skin as common side effects, and it says to speak to a pharmacist or see a GP if your acne gets worse.
• Isotretinoin pills. The AAD says acne may worsen for 1 to 2 months after starting, and adds that acne can worsen when a patient starts other acne treatments too.
• Cleanser, moisturizer and sunscreen. None of the labels or guidelines above describe early worsening from these. New pimples after one of them can mean it clogs pores. The AAD advises choosing a moisturizer labeled non-comedogenic, oil free or "won't clog pores." You can check an ingredient list with the comedogenic checker.

Is purging real?

The research does not agree with the labels. A 2009 review from Wake Forest University looked for trial data on retinoids making acne worse. It reported: "No primary data from clinical trials were identified to support the dogma of acne worsening secondary to topical retinoids." It said some people may have worse acne in the first week or two as part of the normal course of acne. A 2012 analysis of adapalene gel trials found "no evidence of worsening or a flare" after the first week.

So acne that looks worse in week one may be a retinoid effect, or it may be acne doing what it would have done anyway. The instruction is the same either way: keep using the product as directed unless irritation becomes severe. Does retinol make acne worse at first? sets out each source in full.

Purging vs a breakout, side by side

	Early worsening ("purging")	Breakout from irritation or allergy
Where it shows up	Where you already get pimples	Can appear in new places, or wherever the product touched
When it starts	The early weeks of a retinoid, per the adapalene label	Within hours or days of contact, per the NHS
What comes with it	Pimples, with some dryness or redness that the label expects	Burning, itching, swelling, blisters, cracked skin
Direction over time	Settles as you keep going	Stays the same or gets worse
What to do	Keep going, once a day as directed	Cut back or stop, and ask a pharmacist or doctor

The right column matches how the NHS describes contact dermatitis: skin that becomes itchy, blistered, dry and cracked, usually within a few hours or days of contact with the cause. Cosmetics are one of the causes it lists.

How long it should last

No label or guideline gives purging a fixed length. A number you read online, such as "2 to 6 weeks," has no source behind it in the labels or guidelines.

What the sources do give:

• The adapalene label says the early weeks. Its patient leaflet says irritation "usually lessens after 4 weeks of continued use."
• MedlinePlus says skin may become dry or irritated during the first 2 to 4 weeks of adapalene, and that the full benefit can take 8 to 12 weeks or longer.
• For salicylic acid, MedlinePlus says the first few days.

For the result itself, the American Academy of Dermatology says to use an acne product for 6 to 8 weeks before judging it, and that complete clearing generally takes 3 to 4 months. The adapalene label says it may take up to 3 months of once daily use to see results.

If acne is still getting worse after 4 weeks, when the label expects irritation to ease, ask a pharmacist or doctor to look at it. The NHS says to speak to a pharmacist or GP if acne gets worse on benzoyl peroxide. How long an acne routine takes to work covers what to expect each week.

Skinli's guide to how long skin purging lasts sets out the timeline that drug labels give for each acne treatment. If your skin also stings when you apply a plain moisturizer, the cause may be a damaged skin barrier.

Signs of a reaction

Stop the product and ask a doctor if any of these show up. The first two come from the adapalene label:

• Signs of an allergic reaction: itching, rash, hives, swelling of the lips or eyelids, or shortness of breath
• Irritation that becomes severe
• New spots in places where you never break out, together with burning, blisters or cracked skin
• Deep, painful lumps, or spots that leave scars. The NHS says to see a GP for these

Swelling of the lips, mouth, throat or tongue, or trouble breathing, is an emergency. The NHS benzoyl peroxide page says to call 999 in the UK if you think you are having a serious allergic reaction. In the US, call 911.

Too many products at once can cause breakouts on their own. The AAD says "trying too many products can stress your skin, worsening acne," and that changing products every few days can irritate skin and cause new breakouts.

Starting slowly

A slow start lowers irritation. There is no good evidence that it prevents early worsening. The NICE guideline (1.5.7) says to start benzoyl peroxide or a retinoid on alternate days, or to wash it off after an hour, and to move to normal use if the skin copes. The AAD quotes a dermatologist who advises using a retinoid every other night to start.

Adding new products one at a time also helps you read what you see. If two unrelated products start in the same week and your skin reacts, you cannot tell which one caused it. Adapalene with benzoyl peroxide is a pair meant to be used together, and NICE (1.5.1) lists the two as a first-line option for any acne severity. Testing each one on its own small spot first shows which one a reaction comes from. How to patch test a new product covers checking for a reaction on a small spot first, and how to start adapalene covers the first weeks of the gel.

Skinli's plan starts both acne gels every other night for the first 2 weeks, and its sample plan shows what to expect week by week.