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New acne treatments often make skin worse before it gets better. Here is the mechanism behind the purge, how long it should last, and the signs that a product is actually failing you.
August 5, 2026 · Liliana Voss
Weeks two through six on a new retinoid can look worse than week zero. Here is the mechanism behind the flare, how to tell purging from irritation or a true breakout, and the timeline dermatology research actually supports.
August 4, 2026 · Quentin Asare
Higher concentrations of benzoyl peroxide do not clear acne faster, but they do irritate skin more. Here is what the pharmacology actually says, and how to pick a strength that works.
August 3, 2026 · Quentin Asare
The whole evidence base
34 stories
Myth CheckHigher concentrations of benzoyl peroxide dominate pharmacy shelves, but decades of comparative data suggest the extra strength buys more irritation, not more clearance. Here is the mechanism behind why.
· Anneliese Crowther
ExplainerTwo of the most effective acne ingredients can undermine each other depending on which retinoid you use. The difference comes down to molecular stability, and it changes how you should build a routine.
· Quentin Asare
Myth CheckHigher concentrations of benzoyl peroxide dominate pharmacy shelves, but decades of trial data suggest they add irritation without adding clearance. Here is what the mechanism actually tells us.
· Anneliese Crowther
Myth CheckNew retinoid users often break out worse before they get better. Here is what is actually happening under the skin, how long it should last, and the signs that something else is going on.
· Emeka Balogun
ExplainerA laser does not treat acne scars. It treats one geometry of acne scar, and the rest of your face comes along for the downtime. Here is a side-lit census you can run tonight to find out which geometry you actually have, plus the isotretinoin timing rule most clinics still quote that a 2017 consensus panel quietly overturned.
· Quentin Asare
Myth CheckNew acne treatments often make skin worse before it gets better. Here is the mechanism behind the purge, how long it should last, and the signs that a product is actually failing you.
· Liliana Voss
FAQ / Acne treatment
Most patients see meaningful improvement at three to six months. The first six to twelve weeks often include an “initial purge” and irritation. Consistency matters more than aggression.
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