Keratosis pilaris: harmless, stubborn, and nothing to do with hygiene

Keratosis pilaris is a very common, harmless variant of normal skin in which keratin plugs the openings of hair follicles, producing rough sandpapery bumps on the upper arms, thighs, buttocks and sometimes cheeks. It is largely genetic, it often eases with age, and nothing available over the counter cures it. Consistent gentle keratolytic care plus moisturiser can improve how it looks and feels, and it returns when you stop — a clinician is worth seeing if it is inflamed, scarring or affecting the face.

What is happening in the follicle

Keratin, the protein that makes up the outer skin layer, accumulates at the follicle opening and forms a small hard plug. Each plug creates a bump, sometimes with a trapped hair coiled beneath it, sometimes with a ring of redness around it. Korean speakers call the texture 닭살 (dalgsal), chicken skin, and the analogy is fair. It runs strongly in families, is more noticeable in dry weather and winter, and often improves through adulthood without anyone doing anything. It is not caused by poor washing.

What genuinely shifts the look and feel

The ingredients with the best reputation here soften and loosen that keratin: urea, lactic acid and salicylic acid, used in a body lotion or cream, applied consistently. Expect improvement in smoothness over weeks rather than transformation, and expect the bumps to come back within a month or two of stopping. Pair the keratolytic with a plain moisturiser, because these ingredients can sting or dry skin at higher strengths. Redness responds much less well than roughness does, which is worth knowing before buying anything.

What makes it worse

Scrubs, loofahs, dry brushing and exfoliating gloves feel productive and generally increase the redness while doing little to the plugs. Very hot showers and long soaks strip the skin and worsen the accompanying dryness. Picking at individual bumps leaves marks that outlast the bump considerably. Fragranced body washes on already-dry skin are a common irritant. The pattern across all of these is the same: the condition is not dirt, and friction does not remove it — softening and hydrating do more than abrasion ever will.

When it is not simple keratosis pilaris

See a clinician if bumps are persistently inflamed, if they leave scars or small bald patches, if they involve the eyebrows or cheeks in a child, or if there is progressive redness rather than just roughness. Several related conditions look similar and behave differently, and a few involve permanent follicular scarring that is worth catching early. A dermatologist can also confirm it is nothing more than keratosis pilaris, which is often what people actually want. Skincare here is cosmetic smoothing, no more.

Try the free tools

✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed: 2026-08-23.

General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.