Mind the Gap atlas
Scarlet fever on Black skin
Key cue: Fine sandpaper-feel rash, strawberry tongue, flushed cheeks (subtle on Black skin), peeling in groin/armpits in week two.
Scarlet fever is a rash caused by group A streptococcal infection (usually strep throat) producing a toxin-mediated erythematous eruption. It's important to recognise because untreated group A strep can cause rheumatic fever and post-streptococcal glomerulonephritis — both preventable with timely penicillin.
What it actually looks like
Textbook says
Classic textbook description: a child aged 5-15 with sore throat, fever, and a bright red, sandpaper-feel rash that starts on the trunk and spreads, sparing the area around the mouth (circumoral pallor), with flushed cheeks and a strawberry tongue. Images show the fine, erythematous, pinhead papules on light skin.
On Black skin
On darker skin the hallmark redness is subtle or absent; the rash is most reliably detected by touch:
- The sandpaper-feel texture of the fine papules is preserved on all skin tones — run your fingers lightly over the trunk, inner thighs, and upper arms. If it feels like gritty fine sandpaper, that's the rash.
- Pastia lines — linear petechiae-like accentuation in the skin folds (armpits, groin, antecubital fossae) — appear as darker lines against the surrounding skin. These are one of the most reliable visual findings on Black skin.
- Strawberry tongue — red papillae on a white-coated base, then a denuded red tongue — is pigment-independent.
- Flushed cheeks with circumoral pallor may be difficult to see on Black skin; rely instead on the lingual, pharyngeal, and textural findings.
- Week two: desquamation (fine peeling of hands and feet) is identical across skin tones and confirms the diagnosis retrospectively.
What to look for
- Sore throat, fever, and feeling unwell in a child.
- Run your fingers over the upper trunk, inner thighs, and elbow creases — if it feels like sandpaper, that's scarlet fever.
- Look inside the mouth: strawberry tongue (bumpy red).
- Check the armpits, groin, and elbow creases for darker linear bands (Pastia lines).
- Week two: peeling of fingertips or soles.
Urgent — see a clinician within 24 hours
See a clinician within 24 hours. A throat swab plus penicillin V (or amoxicillin) for 10 days eradicates group A strep and prevents rheumatic fever. Do not delay past 9 days — the window to prevent rheumatic fever is the first 10 days of strep infection. Go to the ER for respiratory distress, severe headache with vomiting, or signs of toxic shock (hypotension, confusion, diffuse rash with desquamation).
Common misdiagnosis
On Black skin, scarlet fever is often missed or misread as a simple viral exanthem. The diagnostic pivot is the texture + Pastia lines + strawberry tongue triad, none of which requires bright erythema. A throat swab is cheap and definitive.
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.
- Mind the Gap handbook — scarlet fever plate.
- DermNet NZ — Scarlet fever — image gallery including skin-of-colour examples, Pastia lines, and strawberry tongue.
- CDC — Scarlet fever — clinician and parent-facing image library.
- PMC — Scarlet fever clinical images (open access).
References
- Shulman ST, Bisno AL, Clegg HW, et al. Clinical practice guideline for the diagnosis and management of group A streptococcal pharyngitis: 2012 update by the Infectious Diseases Society of America. Clin Infect Dis. 2012;55(10):e86-102. PMID: 22965026.
- Lamagni T, Guy R, Chand M, et al. Resurgence of scarlet fever in England, 2014-16: a population-based surveillance study. Lancet Infect Dis. 2018;18(2):180-187. PMID: 29191628.
- Mukwende M, Tamony P, Turner M. Mind the Gap. St George's, University of London; 2020.
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.