How often to exfoliate — a guide by skin type and product concentration.

Exfoliation frequency is one of the most misunderstood variables in skincare. Guidance ranges from "daily for glowing skin" to "once a month for sensitive skin" — with little explanation of why. The answer depends on three things: what type of exfoliant is being used, at what concentration, and what the skin's current barrier state can tolerate.

Why frequency matters

Chemical exfoliants — AHAs, BHAs, and PHAs — work by weakening the bonds between dead skin cells at the surface, allowing them to shed more readily. This produces the benefits associated with exfoliation: improved texture, more even tone, reduced congestion. It also thins the stratum corneum — the outermost layer of the barrier — temporarily.

The stratum corneum recovers. The skin replaces shed cells continuously. But that recovery takes time, and if exfoliants are applied before the barrier has rebuilt, each subsequent use leaves the skin in a progressively more compromised state. The endpoint is thin, reactive, sensitised skin — sometimes called over-exfoliation — that paradoxically requires a complete break from all exfoliants to recover.

The right frequency is the highest frequency that allows the barrier to fully recover between sessions. For most people, this is considerably less than daily.

Frequency by exfoliant type

AHAs (glycolic, lactic, mandelic acid) at 5–10%. Once to twice weekly for most skin types. Glycolic acid — the smallest and most penetrant AHA — sits at the lower end of this range for most people (once weekly). Lactic and mandelic acid, which penetrate more slowly, may tolerate twice-weekly use earlier. Concentrations above 10% are typically reserved for monthly or occasional in-clinic treatment and are not appropriate for regular home use.

BHA (salicylic acid) at 0.5–2%. Two to three times weekly for oily and acne-prone skin. BHA's oil-solubility means it penetrates the pore lining rather than working primarily at the surface — its effects are somewhat more targeted and its barrier impact somewhat lower than comparable AHA concentrations. Oily skin, which produces more sebum and maintains a more intact lipid layer, generally tolerates BHA more readily than dry or sensitive skin.

PHAs (gluconolactone, lactobionic acid) at 5–15%. Two to three times weekly, or up to every other night for very tolerant skin. The larger molecular size of PHAs limits penetration depth and irritation risk, making more frequent use possible without the same barrier compromise that AHAs at equivalent use frequency would cause. This is the primary use case for PHAs — more frequent exfoliation for skin that cannot tolerate frequent AHA use.

Physical exfoliants (scrubs, cloths). Once weekly or less. The manual abrasion of physical exfoliants is less controllable than acid exfoliation and more likely to cause micro-tears in the barrier when used aggressively or frequently. Gentle muslin cloths or low-abrasion konjac sponges cause less disruption than grain-based scrubs or stiff brushes.

Frequency by skin type

Skin type	AHA frequency	BHA frequency	PHA frequency
Oily, acne-prone	1–2×/week	2–3×/week	3×/week
Combination	1–2×/week	1–2×/week	2–3×/week
Normal, balanced	1–2×/week	1×/week	2–3×/week
Dry	1×/week or less	Not recommended	1–2×/week
Sensitive / reactive	1×/week or less (lactic/mandelic only)	Not recommended	1–2×/week
Barrier-compromised	None until recovered	None	Cautious, 1×/week

Signs of over-exfoliation

The barrier has been pushed beyond its recovery capacity when: skin feels tight or stinging immediately after cleansing; redness appears after applying products that were previously well tolerated; skin is simultaneously oily and dehydrated-feeling; acne increases rather than decreasing; minor cuts or dry areas take longer than normal to heal.

The appropriate response is a complete break from all exfoliants for two to four weeks, not a reduction in frequency. During recovery: gentle cleanser, a functioning moisturiser with ceramides or squalane, SPF. No actives.

Starting a new exfoliant

Any new exfoliant should be introduced at once weekly regardless of the skin type recommendations above. This gives the skin four to six weeks to adapt before frequency is increased. If no sensitivity, dryness, or increased reactivity appears after two to three weeks, frequency can be raised by one session per week. Build slowly — the goal is the highest frequency the barrier can sustain, which takes weeks to determine.

The Lux & Glo position

The foundational three-step ritual does not include a chemical exfoliant. It is designed to establish a functioning, stable barrier before any exfoliating ingredient is introduced. For skin that is new to active skincare, reactive, or recovering from barrier damage, building that foundation first — and evaluating it over eight to twelve weeks — makes subsequent exfoliation more effective and less likely to cause disruption.

A well-supported barrier tolerates exfoliants better, produces more consistent results, and recovers faster from temporary over-exposure. The barrier comes first. Exfoliation is layered on top of it, not the starting point.