Look for a lightweight, non-comedogenic emulsion with humectants (glycerin, hyaluronic acid) and a small amount of barrier lipids (ceramides, squalane). A fast-absorbing, milk-gel texture helps hydrate without clogging pores or leaving shine.

• PM: cleanse → BHA (2–4 nights/week) → wait 1–3 minutes → niacinamide serum → lightweight moisturizer.
• AM: cleanse → hydrating/soothing serum → moisturizer → SPF 30+.
• If skin feels tight or stings, reduce BHA frequency or buffer by applying moisturizer before BHA.

Common signs include tightness after washing, increased redness, stinging with simple products, flaky patches, and more frequent breakouts. Simplify your routine for 2–3 weeks: gentle cleanser, ceramide-based moisturizer, and daily SPF. Reintroduce actives slowly once comfort returns.

Yes. Humidity and temperature swings affect TEWL and oil flow. In humid months, choose lighter textures and oil-control actives (BHA, niacinamide). In cooler/drier months, increase ceramides/cholesterol/fatty acids, add panthenol (B5), and consider an overnight balm on dry patches. Always keep SPF in daytime routines.