Keratosis pilaris (KP) is treated with topical exfoliants that dissolve the keratin plugs clogging your hair follicles. Lactic acid, salicylic acid, urea, and retinoids are the most effective options, and most are available over the counter. There’s no permanent cure, but consistent use of the right products can reduce bumps significantly, sometimes by more than half within a few months.
Why the Bumps Form
Keratin, a protective protein your skin produces naturally, sometimes accumulates faster than it sheds. In KP, that excess keratin forms sticky plugs inside hair follicles, widening the follicle opening and trapping coiled, brittle hairs beneath the surface. The result is clusters of small, rough, skin-colored or reddish bumps, most commonly on the upper arms, thighs, and cheeks. It’s not an infection or an allergic reaction. It’s a quirk of how your skin cycles through cells.
Lactic Acid and Salicylic Acid
These are the two best-studied ingredients for KP, and both are widely available in drugstore lotions and body washes. In a clinical trial comparing the two head to head, patients who applied 10% lactic acid cream twice daily for three months saw a 66% reduction in bumps. Those using 5% salicylic acid saw a 52% reduction over the same period. Both were considered safe and well tolerated.
Lactic acid is an alpha hydroxy acid (AHA) that loosens the bonds between dead skin cells, helping the plugs break apart while also drawing moisture into the skin. Salicylic acid is a beta hydroxy acid (BHA) that’s oil-soluble, meaning it can penetrate into the follicle itself to dissolve buildup from the inside. For that reason, some dermatologists recommend salicylic acid for bumps and lactic acid for rough texture, though both address the core problem.
Ammonium lactate, a prescription-strength form of lactic acid, is another common option. It works the same way but at a higher concentration, which can be helpful if over-the-counter formulas aren’t making enough of a difference.
Urea Creams
Urea is a powerful moisturizer and mild exfoliant rolled into one. It softens the keratin plugs while hydrating the surrounding skin, which makes it especially useful in drier months when KP tends to flare. Over-the-counter creams typically range from 10% to 20% urea. Higher concentrations exfoliate more aggressively, so starting at 10% and increasing if needed is a reasonable approach. Urea is gentler than most acids, making it a good fit if your skin is sensitive or easily irritated.
Retinoids for Stubborn Cases
Topical retinoids speed up cell turnover, preventing dead cells from piling up inside follicles. In case reports, patients using a low-concentration retinoid nightly saw KP fade within two weeks and fully resolve after four to eight weeks. Dermatologists consider retinoids to have a “good clinical response” for KP, though large-scale clinical trials are still lacking, and use remains somewhat based on clinical experience rather than rigorous studies.
Over-the-counter retinol products can help with mild KP. For more noticeable bumps, a prescription retinoid is stronger and works faster. The trade-off is irritation: redness, peeling, and dryness are common in the first few weeks. Starting with every other night and gradually increasing frequency helps your skin adjust. Retinoids also increase sun sensitivity, so sunscreen on treated areas is important.
Pulsed Dye Laser for Redness
If the bumps themselves have mostly resolved but you’re left with persistent redness, a pulsed dye laser (PDL) can help. PDL targets the blood vessels responsible for that flushed, irritated look. In published cases, erythema (redness) and visible plugs improved after just one session, with the results described as “clinically optimal.” This is typically reserved for KP that hasn’t responded to topical treatments, and it’s done in a dermatologist’s office. It’s particularly effective for KP on the face, where redness is more cosmetically bothersome.
Building a Daily Routine
The most effective approach combines an exfoliant with consistent moisturizing. A simple routine looks like this:
- Cleanser: A gentle, fragrance-free body wash. Harsh soaps strip moisture and worsen the rough texture.
- Exfoliant: A lotion or cream containing lactic acid, salicylic acid, or urea, applied to affected areas once or twice daily.
- Moisturizer: A thick, fragrance-free moisturizer layered on top, especially after bathing when skin is still slightly damp.
- Sunscreen: On any treated skin that’s exposed to sunlight, since chemical exfoliants and retinoids increase UV sensitivity. Sunburn itself can worsen KP.
Avoid scrubbing aggressively with loofahs or physical exfoliants. While it’s tempting to buff the bumps away, rough scrubbing irritates the follicles and can make redness worse. Chemical exfoliants do the same job without the inflammation.
How Long Treatment Takes
With retinoids, visible improvement can start within two weeks. With acid-based exfoliants, most people need at least four to six weeks of consistent, twice-daily use before the texture noticeably changes, with peak results around the three-month mark. The key word is consistent. Sporadic use won’t produce meaningful results because new keratin plugs form continuously.
What Happens When You Stop
KP is a chronic condition, and treatments manage it rather than eliminate it permanently. In a survey of board-certified dermatologists, over 60% reported that their patients’ bumps returned within three months of stopping salicylic acid treatment or regular moisturizing. This is the most important thing to understand about KP: it requires ongoing maintenance. Many people find they can scale back to a few applications per week once their skin improves, but stopping entirely usually means the bumps come back.
The good news is that KP often improves naturally with age. Many people who had prominent bumps in their teens and twenties notice a gradual fading through their thirties and beyond, even without treatment. In the meantime, a simple routine with the right active ingredients keeps it well controlled for most people.