Alpha hydroxy acids (glycolic, lactic, mandelic) and beta hydroxy acids (salicylic acid) are the most evidence-based over-the-counter exfoliation ingredients. But their mechanisms, skin targets, and optimal combinations are poorly understood by most consumers.
AHAs work on the upper stratum corneum, dissolving the corneodesmosomes that hold dead skin cells together. Best for: uneven texture, dry flakiness, mild pigmentation, fine lines. Glycolic acid (smallest molecule, deepest penetration), Lactic acid (gentler, better for sensitive Indian skin), Mandelic acid (largest AHA molecule, gentler, excellent for Indian skin PIH concerns).
Salicylic acid is oil-soluble and penetrates the sebaceous gland itself, dissolving oil-based plugs. Best for: blackheads, whiteheads, congestion, active acne, enlarged pores. Using AHA + BHA simultaneously increases overall acid load, strips the barrier, and elevates PIH risk in darker skin tones. The evidence-based approach: use one acid maximum per day; alternate days if using both.
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Acne vulgaris in urban Indian populations shows high correlation with sebum overproduction, follicular hyperkeratinization, and microbiome imbalance. Environmental factors (PM2.5, humidity) amplify inflammatory cascades.
Read reportA 12-week split-face RCT of 1,400 Indian women reveals that salicylic acid and niacinamide target completely different acne mechanisms. Using the wrong one wastes 3 months. Using both correctly clears acne 48% faster than either alone.
Read reportAudit of 3,500 Indian acne patients' routines reveals that 74% are making at least 3 evidence-based mistakes that actively worsen their acne. Over-exfoliation, barrier destruction, and wrong-order application are the top three.
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