Dermatology/Topical acne agent

Topical acne agents

also: benzoyl peroxide · adapalene · azelaic acid · topical clindamycin

Overview

First-line acne treatment is a topical fixed-combination for 12 weeks. Always pair a topical antibiotic with benzoyl peroxide to limit resistance.

Mechanism

Benzoyl peroxide releases free radicals → bactericidal to Cutibacterium acnes and comedolytic. Topical retinoids (adapalene/tretinoin) normalise follicular keratinisation (comedolytic + anti-inflammatory). Azelaic acid is antimicrobial + comedolytic. Topical antibiotics (clindamycin) reduce C. acnes.

Indications

Mild–moderate acne vulgaris
Rosacea (azelaic acid / ivermectin)

The agents

Benzoyl peroxideantimicrobial/comedolytic

No resistance; bleaches fabrics/hair.

Adapalene / tretinointopical retinoid

Avoid in pregnancy; photosensitising.

Topical clindamycinantibiotic

ONLY with benzoyl peroxide (resistance).

Azelaic acidantimicrobial/comedolytic

Pregnancy-safe option; also rosacea.

Adverse effects

Local irritation, dryness, peelingcommon

Bleaching of fabrics/hair (benzoyl peroxide)common

Photosensitivity (retinoids)common

Cautions & contraindications

Topical retinoid in pregnancypregnancy

Use benzoyl peroxide/azelaic acid instead.

Interactions

Topical retinoid + benzoyl peroxide can be inactivating if applied together (use am/pm) — but fixed combos are formulated to be stable

Monitoring & kinetics

Review at 12 weeks; step up to oral if inadequate

Topical. NICE NG198: offer a 12-week fixed combination first-line.

Source: NICE NG198 — Acne vulgaris · BNF — Acne (topical)