How to treat keratosis pilaris ("strawberry skin")

Lactic acid is the best starting active for keratosis pilaris because it does two jobs at once. As an alpha-hydroxy acid it gently dissolves the keratin plugging the hair follicles — the bumps — and as a component of skin's natural moisturizing factor it hydrates the dry, rough texture that comes with KP. The studied body strength is around 12%. Glycolic acid is a stronger AHA option for stubborn bumps, but it tends to be more irritating on the already-dry skin KP brings, so most people do better starting with lactic.

• Study 12% lactic acid applied twice daily for 3 months produced increased epidermal and dermal firmness and thickness, and clinical improvement in skin smoothness and wrinkle appearance; 5% lactic acid produced similar epidermal changes but no measurable dermal changes. ¹
• Review Lactic acid is a component of the skin's natural moisturizing factor (NMF) — the pool of water-soluble hygroscopic compounds resident in corneocytes — accounting for a meaningful fraction of total NMF that maintains stratum corneum hydration. Its presence in NMF distinguishes it from glycolic acid and explains its dual exfoliant-plus-humectant profile. ²

Salicylic acid adds a different angle. It is oil-soluble — so unlike the water-loving AHAs it can penetrate into the follicle itself — and it works by desmolysis, breaking down the cell-junction 'glue' that holds the keratin plug together. A salicylic acid body wash or lotion pairs naturally with lactic acid: the AHA resurfaces and hydrates, the BHA gets down into the bumps.

• Review Beta-hydroxy acids (BHAs) such as salicylic acid are lipid-soluble in contrast to the water-solubility of alpha-hydroxy acids (AHAs); this lipid-solubility allows BHAs to penetrate into the skin through sebaceous follicles, making them appropriate for patients with oily skin and open comedones. ³
• Study Salicylic acid is a desmolytic agent — it disrupts cellular junctions (desmosomes) rather than lysing intercellular keratin filaments, distinguishing its keratolytic mechanism from simple keratin-dissolving agents. ⁴

The mistake most KP routines make is acid without moisture. KP skin has an impaired barrier and chronic dryness, and exfoliating acids alone can leave it raw. Ceramides are the dominant lipid of the skin barrier, and a ceramide body cream layered over your acid restores that barrier and locks in water — which is what actually keeps the skin smooth instead of irritated. Acid to exfoliate, ceramides to repair: KP responds to both, not either alone.

• Study A ceramide-dominant, physiologic lipid-based topical emulsion with a 3:1:1 ratio of ceramides:cholesterol:free fatty acids improved atopic dermatitis signs and symptoms in a 50-center, open-label interventional study of 207 patients. ⁵
• Review The stratum corneum lipid matrix is composed of approximately 50% ceramides, 25% cholesterol, and 15% free fatty acids by weight — an approximately 1:1:1 molar ratio of these three lipid classes. ⁶

What is the best ingredient for keratosis pilaris (strawberry skin)?

Lactic acid is the best starting point — it gently dissolves the keratin plugs that cause the bumps and hydrates the dry skin at the same time. Pair it with a ceramide moisturiser to repair the barrier, and add a salicylic acid body wash to reach into the follicles. Glycolic acid is a stronger alternative for stubborn cases, but it is more irritating on dry KP skin. ¹³

Why do exfoliating acids alone not fix KP?

Because KP is dry, barrier-impaired skin as much as it is clogged follicles. Acids dissolve the plugs, but used alone on already-compromised skin they can leave it raw and inflamed. Ceramides — the main barrier lipid — restore the skin's moisture barrier, so layering a ceramide cream over your acid is what makes the difference between smooth skin and irritation. ⁵⁶

Can you cure keratosis pilaris permanently?

No — KP is a benign, chronic condition, so the realistic goal is management rather than a permanent cure. The good news is it is harmless, it usually improves with consistent exfoliation and moisture, and it often eases on its own with age. But it tends to return if you stop treating it, so think of it as ongoing maintenance, not a one-time fix. ¹⁴

Should I scrub keratosis pilaris bumps?

No. Physical scrubbing with brushes or harsh scrubs irritates the follicles and can make KP worse, not better. The bumps are keratin plugs deep in the follicle, not surface dirt — they respond to chemical exfoliation (lactic, salicylic) that dissolves the plug, combined with barrier-repairing moisture, not to mechanical abrasion. ⁴⁶

1. 1

   Epidermal and dermal effects of topical lactic acid

   Smith WP · Journal of the American Academy of Dermatology 35(3 Pt 1):388-91 · 1996

2. 2

   Dual Effects of Alpha-Hydroxy Acids on the Skin

   Tang SC, Yang JH · Molecules 23(4):863 · 2018

3. 3

   Hydroxy acids, the most widely used anti-aging agents

   Moghimipour E · Jundishapur Journal of Natural Pharmaceutical Products 7(1):9-10 · 2012

4. 4

   Salicylic acid as a peeling agent: a comprehensive review

   Arif T · Clinical, Cosmetic and Investigational Dermatology 8:455-461 · 2015

5. 5

   Evaluating Clinical Use of a Ceramide-dominant, Physiologic Lipid-based Topical Emulsion for Atopic Dermatitis

   Leon H Kircik, James Q Del Rosso, Daniel Aversa · J Clin Aesthet Dermatol 4(3):34-40 · 2011

6. 6

   Role of lipids in the formation and maintenance of the cutaneous permeability barrier

   Kenneth R Feingold, Peter M Elias · Biochim Biophys Acta 1841(3):280-94 · 2014