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In a 3 yo childs calf region. Whats this

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tinea corporis ringworm annular lesion child skin raised scaly border

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"tinea corporis"[MeSH Terms] AND children

This looks like classic tinea corporis (ringworm) - a superficial dermatophyte skin infection.
Why it fits:
  • Sharply demarcated, round/oval plaque with a raised, scaly, slightly polycyclic (scalloped) active border
  • Central clearing with lighter, less inflamed skin in the middle
  • Single, isolated lesion on an exposed area (calf) - a classic contact site (from a pet, contaminated object, or another infected person/animal)
  • Very common presentation at this age, since young children pick up dermatophytes easily from pets (cats/dogs), sandboxes, or other children
As one dermatology reference describes it: "Tinea corporis... presents as a sharply marginated, annular lesion with raised or vesicular margins and central clearing" - Rosen's Emergency Medicine, p. 1608-1612. Andrews' Diseases of the Skin similarly notes lesions have "annular outlines that give them the name 'ringworm'" and can widen over time - Andrews' Diseases of the Skin, p. 1936-1938.
Key differentials to keep in mind (a clinician would rule these out on exam):
  • Granuloma annulare - annular but usually skin-colored/violaceous, firm, non-scaly, and not typically itchy or infectious-looking
  • Nummular eczema - usually more diffusely scaly/crusted without the sharp advancing scaly rim
  • Erythema annulare centrifugum - trailing scale on the inner edge, usually multiple lesions
  • Granuloma annulare, annular psoriasis, or a healing insect bite - less likely given the well-defined scaly active border seen here
What I'd recommend:
  1. Have this examined in person by a pediatrician or dermatologist - a simple KOH scraping of the scale can confirm dermatophyte hyphae in minutes.
  2. If confirmed tinea corporis, treatment is typically a topical antifungal (e.g., terbinafine or clotrimazole cream) applied to the lesion and a margin beyond it for 2-4 weeks, continuing about a week after visible clearing.
  3. Avoid topical steroids alone (can worsen/mask the infection - "tinea incognito").
  4. Check for a source - pets with skin lesions, other affected family members/classmates, shared clothing or bedding - and treat/avoid re-exposure.
  5. Keep the area clean and dry, avoid tight occlusive dressings.
I did not find any 2023-2025 pediatric tinea corporis-specific systematic reviews/meta-analyses that would change this general approach (the recent reviews I found were on tinea pedis/capitis prevalence, not corporis treatment), so standard topical antifungal management still applies.
That said, this is based on a single photo - if the lesion is spreading rapidly, very itchy, painful, has pustules, or isn't improving with an OTC antifungal cream after 1-2 weeks, please have your child seen in person for confirmation and possibly an oral antifungal if it's extensive.
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