What is skin purging — and how to tell it apart from a reaction.

A common experience when starting retinoids, AHAs, or BHAs: the skin, rather than improving, breaks out. Blemishes appear in areas that did not previously have them. The new routine feels counterproductive.

In many cases, this is purging — a temporary and expected response, not a sign the active is wrong for the skin.

What purging is

Purging is an increase in breakouts that occurs when an ingredient accelerates the rate at which skin cells turn over. Beneath the surface of most people's skin, there are microcomedones — the earliest stage of a developing blemish, too small to see or feel — cycling slowly through the follicle. When a cell-turnover-accelerating active is introduced, these microcomedones are pushed to the surface on an accelerated schedule.

The key point: these blemishes were already forming. Purging does not create new congestion — it surfaces pre-existing congestion faster than it would otherwise appear.

Which ingredients cause purging

Not all new breakouts after starting a product are purging. The mechanism requires an ingredient that directly accelerates cell turnover or follicular clearing.

Ingredients that can cause purging: retinoids (retinol, adapalene, tretinoin), AHAs (glycolic acid, lactic acid), BHAs (salicylic acid), benzoyl peroxide.

Ingredients that should not cause purging: vitamin C, niacinamide, hyaluronic acid, peptides, most moisturisers, most cleansers. Breaking out after introducing any of these is not purging — it is more likely a reaction to a comedogenic ingredient, an irritant, or an allergen.

How to tell purging from a reaction

The distinction matters because the correct response is the opposite in each case: purging resolves if you continue using the active; a reaction resolves only if you stop.

Location. Purging appears in areas where skin normally breaks out. Congestion surfacing on a chin that regularly develops blemishes is consistent with purging. Blemishes appearing across the cheeks in someone who never breaks out there is not.

Timeline. Purging typically peaks in weeks two to four and resolves within six to eight weeks of consistent use. If skin is significantly worse after eight weeks, it is unlikely to be purging.

Lesion character. Purging tends to produce smaller, faster-healing blemishes — the type the skin forms in its normal breakout pattern, arriving sooner. A reaction is more likely to produce large, painful, cystic lesions unlike the usual pattern, or widespread irritation and redness that extends beyond the blemishes.

Allergic signs — hives, spreading redness, itching, swelling — are never purging. Stop the product immediately if these appear.

What to do during a purge

Continue using the active and allow time. The purge resolves as the pre-existing microcomedones clear through.

If the purge is severe, reduce the frequency of application — not the concentration — and build back gradually. Keep the rest of the routine minimal during the transition period; fewer variables make it easier to assess what is happening and reduce additional stress on the barrier.

Do not squeeze. Purging blemishes are already close to the surface and resolve faster without trauma. Manual squeezing increases post-inflammatory hyperpigmentation risk and can stretch the follicle opening.

Do not introduce other new products while purging. One variable at a time makes troubleshooting possible.

The Lux & Glo position

The Niacinamide Boost Serum does not accelerate cell turnover and should not cause purging. Niacinamide works through melanin transfer inhibition, sebum regulation, and anti-inflammatory pathways — not through keratinocyte differentiation. Unexpected blemishes after starting the serum would prompt a look at other changes in the routine rather than a purge explanation.

If a retinoid or BHA is added to the three-step ritual as an additional active — which the ritual supports — a purge period is possible. It is temporary. Skin that has a well-established foundation in cleansing, treatment, and hydration tends to pass through the transition and settle into improved texture and clarity.

The transition period is not a reason to stop. It is the process working as expected.