BHA (Salicylic Acid)

• Damaged or compromised barrier — Acids worsen broken-skin irritation — pause until healed.
• Heavy sun exposure — Daily SPF 30+ is non-negotiable while using exfoliating acids.

Common conflicts & pairings

Click any pairing to see the full compatibility report.

• Caution
  BHA (Salicylic Acid) + Retinol — BHA (salicylic acid) penetrates oil and is more tolerated on tretinoin-treated skin than AHAs, but still adds irritation load. Dermatologists sometimes prescribe both for severe acne — with strict alternating schedules.
• Caution
  BHA (Salicylic Acid) + AHA (Alpha Hydroxy Acid) — AHA works on surface skin cells, BHA penetrates oily pores. Some formulas combine them intentionally (e.g. Paula's Choice BHA) but DIY layering two separate acid products usually over-exfoliates, especially on sensitive skin.