Reviewed November 9, 2026

Body Exfoliation for Keratosis Pilaris: The Arms-and-Legs Routine That Works

Use a leave-on lactic or salicylic acid lotion on the bumps two to three times a week, and moisturize within five minutes of showering while the skin is still damp. Improvement takes four to six weeks, and the bumps come back if you stop, because there is no permanent cure.

The small rough bumps on the backs of your upper arms and thighs have a name, keratosis pilaris, and they are not dirt, not acne, and not something a scrub will fix. They are plugs of keratin sitting inside the hair follicles, and they are harmless, genetic, and extremely common.

The routine that works is unglamorous and slow. A chemical exfoliant two to three times a week, a moisturizer applied while the skin is still damp, and patience measured in weeks. That is the whole system, and it is the one dermatologists actually recommend.

Chemical beats physical here

A scrub rubs the surface. The plug sits inside the follicle, below the surface, and a scrub cannot reach it. A chemical exfoliant dissolves the keratin holding the plug together, which is why it works where scrubs do not. Lactic acid is the gentlest of the alpha hydroxy acids and doubles as a humectant, pulling water into the skin while it works. Salicylic acid is oil-soluble, so it gets into the oily plug more easily. Urea softens keratin while it hydrates.

Use a leave-on lotion, not a wash. A body wash with acid rinses off in a minute, and a minute is not long enough to do anything. A lotion stays on the skin and works for hours. Two to three times a week is the starting point, and more is not better: daily acid on body skin causes the same irritation it causes on the face.

The routine, and the patience curve

Patch test first, on the inside of the forearm, and wait 24 hours. Then apply the acid lotion to the bumps two to three times a week, after showering. Moisturize with a cream containing ceramides, glycerin, or petrolatum within five minutes of getting out of the shower, while the skin is still damp. Sunscreen goes on the next morning, because alpha hydroxy acids raise photosensitivity.

Results take four to six weeks, and the American Academy of Dermatology says to tell a dermatologist if nothing has helped after four to six weeks. That timeline is the honest one. The bumps are a maintenance problem, not a curable one, and they return when the routine stops.

What not to do

Do not scrub harder. A scrubbing glove or a harsh physical exfoliant will irritate the skin around the bumps without touching the plugs, and the irritation makes the bumps look worse. Do not use daily acids, do not apply acid to freshly shaved or broken skin, and do not expect a cure. The goal is smoother skin that stays that way with maintenance, not a permanent fix.

Do not buy the product that promises to erase the bumps in a week. Keratosis pilaris is a structural feature of the skin, not a surface problem, and a week is not long enough for any exfoliant to change it. If a product promises otherwise, it is promising something the biology does not allow.

Frequently asked questions

What causes keratosis pilaris?

It is a buildup of keratin, the protein that makes up skin and hair, plugging the hair follicles. It is genetic and harmless, and it most often appears on the upper arms, thighs, and cheeks. It is not caused by poor hygiene, and scrubbing will not remove it.

How often should I exfoliate keratosis pilaris?

Two to three times a week with a leave-on lactic or salicylic acid lotion is the usual recommendation. Daily acid is more likely to irritate the skin than to speed results, and a body wash with acid rinses off too fast to do much.

How long does it take for keratosis pilaris to improve?

Plan on four to six weeks of consistent use before judging the result. The American Academy of Dermatology says to tell a dermatologist if nothing has helped after four to six weeks, because a prescription option may be worth discussing.

Does moisturizing help keratosis pilaris?

Yes, it is half the routine. Apply a cream with ceramides, glycerin, or petrolatum within five minutes of showering, while the skin is still damp, to lock the water in. Moisturizer alone will not clear the bumps, but acid without moisturizer leaves the skin dry and irritated.