Topical retinoids — adapalene, tretinoin and their relatives — are among the most effective acne treatments available and are recommended by NICE as part of first-line care. They also cause redness, peeling, dryness and stinging in the early weeks, and that is when most people stop.
The irritation is not an allergy and not a sign the product is wrong. It is the adjustment period, and it can be managed down to something tolerable.
How to Start
- Start low and slow. Two or three nights a week for the first fortnight, building up gradually. Nightly from day one is the single most common mistake.
- Pea-sized amount for the whole face. More does not work better and irritates more.
- Apply to dry skin. Wait 20 to 30 minutes after washing. Damp skin increases penetration and increases irritation.
- Moisturise. Either before the retinoid as a buffer, or after. A plain, fragrance-free moisturiser is fine.
- At night. Retinoids degrade in light and increase sun sensitivity.
Sunscreen Is Not Optional
Retinoids make skin more sensitive to UV. Daily sunscreen protects the skin, prevents post-inflammatory pigmentation from getting worse, and is more important than any additional active you might be tempted to add.
The Purge
Skin often looks worse before it looks better, typically for the first four to six weeks. Retinoids accelerate the cycle of the follicle, which brings existing blockages to the surface faster.
Distinguishing the purge from a genuine reaction: a purge produces spots where you normally get them, and it settles. A reaction spreads to areas that were clear, or produces significant swelling, burning or a rash — that is a reason to stop and get advice.
What Not to Combine
- Exfoliating acids (glycolic, salicylic) on the same night — pick one
- Scrubs and physical exfoliants — unnecessary and counterproductive on retinoid-treated skin
- Multiple new products at once — if something reacts, you will not know what
Benzoyl peroxide is a special case. It combines well with adapalene and fixed combination products exist for exactly that reason. With tretinoin, older advice was to separate them by time of day because of degradation concerns; modern formulations vary, so follow the specific product's instructions.
How Long Before It Works
Expect at least 12 weeks before judging. Meaningful improvement often continues for months beyond that. Retinoids are slow, and photographs are far more reliable than day-to-day impressions.
Prescription and Pregnancy
Adapalene is available over the counter in some formulations and on prescription in others; tretinoin is prescription-only in the UK. Fixed combinations with benzoyl peroxide or clindamycin are prescription-only.
Topical retinoids should not be used in pregnancy or when trying to conceive. If that applies, say so before a prescription is issued.
The Long Game
The most valuable role of a topical retinoid is often maintenance: continuing after an antibiotic course finishes, keeping skin clear without ongoing antibiotic exposure. That is the strategy that avoids the cycle of repeat antibiotic courses — and it only works if you are still using the retinoid, which brings it back to surviving the first month.