Keratosis Pilaris: What Actually Clears Those Little Bumps on Your Arms

What's actually happening in your skin

Keratosis pilaris happens when keratin — the protein that makes up your outer skin layer — overproduces and blocks individual hair follicles. The result is the characteristic cluster of small, rough bumps, most often on the backs of the upper arms and outer thighs, though the face, buttocks, and back can also be affected.

The bumps aren't infected. They're not caused by oil or bacteria. There's no pore being "clogged" in the way acne works. This is why scrubbing harder — or treating KP like body acne — doesn't help and often inflames the skin further.

The tendency toward KP is genetic, often linked to mutations affecting filaggrin, a protein that helps maintain the skin barrier. Women with atopic dermatitis (eczema) or ichthyosis are more likely to have significant KP. It's also influenced by skin dryness: KP typically worsens in winter, in dry climates, and after heating season begins. Hormonal changes — particularly pregnancy and perimenopause — can also influence severity through their effects on skin hydration.

What the evidence says actually works

Chemical exfoliants are the best-supported topical approach. AHAs (particularly lactic acid and glycolic acid) dissolve the protein bonds holding dead skin cells together, helping to clear keratin plugs without physical abrasion. BHAs (salicylic acid) are also useful, especially if there's redness alongside the bumps. Urea, in concentrations of 10–40%, works as both a keratolytic and a humectant — softening the keratin plug while hydrating the surrounding skin.

A 2024 systematic review in Clinical and Experimental Dermatology assessed treatment evidence across modalities. Laser and light therapies — particularly the Nd:YAG laser — showed the strongest overall evidence base, with meaningful reductions in bump texture and redness. Pulsed dye laser is another option for cases with significant accompanying redness (keratosis pilaris rubra). These are clinic-based treatments, not at-home options, and they're not permanent.

What doesn't work

Physical scrubbing, loofahs, and pumice stones. These remove surface dead skin temporarily but don't address the keratin plug in the follicle — and repeated abrasion inflames the skin, making the redness component worse.

Antibacterial body washes. KP is not bacterial. These do nothing specific for it.

Most "KP treatments" marketed on social media. Dry brushing in particular has no clinical support for KP improvement. The improvement some people report likely comes from increased moisturiser use rather than the brushing itself.