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Routine Dermatology

Mind the Gap atlas

Acne and acne keloidalis nuchae on Black skin

Key cue: Dark marks after pimples often concern patients more than active acne. AKN (firm bumps on posterior scalp) is a distinct Black-skin entity needing dermatology care.

Acne vulgaris affects > 80% of adolescents across all skin tones, but the sequelae differ markedly on Black skin: post-inflammatory hyperpigmentation is more prominent and prolonged, keloidal scarring is more common, and a specific variant, acne keloidalis nuchae (AKN), almost exclusively affects Black men.

What it actually looks like

Textbook says

Textbook: comedones (open and closed), inflammatory papules and pustules, nodules, cysts. Distribution on face, chest, back. Standard treatment algorithm: topical retinoid + benzoyl peroxide ± topical antibiotic; severe cases oral doxycycline or isotretinoin.

On Black skin

Three features specific to Black skin:

  • Post-inflammatory hyperpigmentation (PIH), dark marks that linger for months after the active pimple resolves, is the patient's primary concern and is often more bothersome than the acne itself. Treating the active acne aggressively minimises PIH; addressing existing PIH uses sun protection, topical retinoids, azelaic acid, and sometimes hydroquinone.
  • Pomade acne, comedonal acne on the forehead, temples, and hairline from heavy hair products, is common in patients using styling pomades or hair oils. Look at the distribution.
  • Acne keloidalis nuchae (AKN), firm, persistent papules and plaques on the posterior scalp and nape of the neck, often in rows, is almost exclusively a disease of Black men. It begins as folliculitis and progresses to keloid-like scarring with scarring alopecia. Do not pick or pluck; avoid close-cut shaving at the nape; early dermatology referral for topical and intralesional steroid therapy prevents progression.
  • Pseudofolliculitis barbae (razor bumps) is an allied condition, ingrown hairs from curly hair re-entering the skin after shaving. Treatment: avoid close shaving, use single-blade razors, chemical depilatories, or laser hair removal.

What to look for

  • Active acne: comedones, papules, pustules, or deeper cysts.
  • Dark marks (PIH) where old pimples used to be, these are not scars and will fade slowly with time + sun protection.
  • True scars: ice-pick, rolling, or boxcar depressions that are texture changes; these need dermatology intervention.
  • Firm bumps on the posterior scalp/nape of the neck in a Black man, this is AKN, get dermatology attention before it spreads.
  • Bumps only along the beard line after shaving, pseudofolliculitis barbae.

When to seek care

See primary care or dermatology within a few weeks for persistent acne or AKN. Addressing AKN early, before plaques coalesce and form thick keloids, dramatically improves outcome. Isotretinoin for severe acne is as effective in Black patients as white; do not let bias exclude you from this therapy. Ask about laser hair removal if pseudofolliculitis barbae is a persistent problem.

Common misdiagnosis

AKN is often initially misdiagnosed as simple folliculitis or 'ingrown hairs', delaying effective treatment. PIH is sometimes mislabelled as scarring, leading patients to believe it is permanent when most of it will fade over 6-12 months.

See it for yourself, curated external imagery

We don't host clinical photos here. The links below go to peer-reviewed or open-access sources (Mind the Gap, DermNet NZ, PubMed Central, and similar). Each opens in a new tab.

References

  • Alexis AF, Sergay AB, Taylor SC. Common dermatologic disorders in skin of color: a comparative practice survey. Cutis. 2007;80(5):387-94. PMID: 18189024.
  • Ogunbiyi A. Acne keloidalis nuchae: prevalence, impact, and management challenges. Clin Cosmet Investig Dermatol. 2016;9:483-489. PMID: 27980431.
  • Callender VD, St Surin-Lord S, Davis EC, Maclin M. Postinflammatory hyperpigmentation: etiologic and therapeutic considerations. Am J Clin Dermatol. 2011;12(2):87-99. PMID: 21348540.
  • Taylor SC, Cook-Bolden F, Rahman Z, Strachan D. Acne vulgaris in skin of color. J Am Acad Dermatol. 2002;46(2 Suppl):S98-106. PMID: 11807473.

Medical disclaimer

Educational content only. This is not a substitute for in-person evaluation. If you are worried about yourself or someone you love, see a clinician, and if you are concerned about an emergency sign described here, call 911 or your local emergency number. We do not host clinical imagery; the external references are for reader self-education and are not owned by or affiliated with Black Health.

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