Acne Cysts (Nodulocystic Acne): Causes, Symptoms, and Treatment Options

An acne cyst (cystic lesion, nodulocystic acne) is a severe, deep inflammatory acne lesion. It forms when a hair follicle becomes occluded with sebum, dead keratinocytes, and Cutibacterium acnes, leading to rupture of the follicular wall, intense inflammation, and a large, pus‑filled cavity deep in the dermis.

Clinical Features

• Large (>5 mm), fluctuant, tender nodules.
• Red to violaceous hue; often painful without manipulation.
• Common sites: face, neck, upper trunk, shoulders.
• Heal slowly (weeks to months); high risk of atrophic or hypertrophic scarring.

Treatment Algorithm

First‑Line (Topical + Systemic)

• Topical retinoid (tretinoin, adapalene, tazarotene) nightly → normalizes follicular keratinization.
• Oral antibiotic (doxycycline, minocycline, sarecycline) 12–16 weeks → anti‑inflammatory + antimicrobial.
• Benzoyl peroxide wash/leave‑on → reduces C. acnes and resistance.

Second‑Line / Adjunctive

• Oral isotretinoin: Definitive for severe, scarring, or refractory nodulocystic acne. Requires iPLEDGE monitoring (teratogenicity, lipids, LFTs).
• Hormonal therapy (females): Combined OCP or spironolactone for androgen‑driven acne.
• Intralesional corticosteroid injection: Rapidly reduces inflammation/pain in individual cysts.

Procedural (for residual scars)

• Laser (fractional CO₂, erbium), microneedling RF, subcision, filler, TCA cross.

Early aggressive treatment prevents permanent scarring. Dermatology referral is warranted for any nodulocystic acne.