Over-exfoliation is the single most common avoidable skincare problem. Daily acid use, daily scrubs, or both at once breaks down the skin barrier faster than it rebuilds. The result looks like 'sensitive skin' that isn't innately sensitive — it's just been over-treated.
How exfoliation should actually scale
AHAs (glycolic, lactic, mandelic)
Twice weekly to start. Every other night max once tolerated. Never daily for most skin types.
BHA (salicylic)
Slightly more tolerated; 3-5 nights weekly is fine. Daily only if no irritation signs after a month.
Enzyme exfoliants (papain, bromelain)
Gentlest. Daily use is OK for most skin.
Physical scrubs (sugar, jojoba beads, brushes)
Once weekly maximum. Never combine with acid exfoliants on the same night.
Signs you're over-exfoliating
Skin that looks 'glassy' or shiny in a way that isn't from healthy oil. New sensitivity to products that previously didn't sting. Persistent redness, especially around the nose and cheeks. New breakouts in unusual places (broken barrier letting in routine bacteria). Excessive flaking that no moisturiser fixes.
The barrier-repair month
Stop all actives. Only gentle cream cleanser, ceramide-rich moisturiser, sunscreen morning. Do this for 4 weeks. Skin will recover and start tolerating products it previously reacted to. Reintroduce one active at a time, monthly, building back to a maintainable routine.
Exfoliation is supposed to be a tool, not a daily habit. Less is almost always more, and when in doubt, skip a night.