Tinea Corporis (ringworm)

Description

Across the anterior trunk of an adult male, multiple annular erythematous plaques spread over the pectoral region and upper abdomen, each with a raised, scaly active border and relative central clearing. Lesions cluster bilaterally across the right and left chest and extend inferiorly toward the epigastrium and periumbilical skin, with intervening areas of clinically normal epidermis. The distribution respects the midline only loosely, consistent with multifocal inoculation rather than a single contiguous rash. Borders matter. Tinea corporis (dermatophytosis) is often diagnosed by its advancing peripheral scale, and this anterior view makes that leading edge easy to appreciate when teaching pattern recognition. In clinic, the key pitfall is mistaking these plaques for nummular eczema, pityriasis rosea, or psoriasis and then applying topical corticosteroids, which can blunt the border and create tinea incognito while the dermatophyte burden increases. When uncertainty remains, a bedside KOH preparation scraped from the active margin, not the clear center, typically demonstrates segmented hyphae; culture may be used for recalcitrant infection or outbreaks linked to contact sports, pets, or shared fomites. Extensive trunk involvement like this often prompts evaluation for concomitant tinea cruris or tinea pedis as reservoirs and guides choice between topical allylamines/azoles versus systemic therapy. Use this asset to anchor lectures in dermatology and infectious disease blocks when covering superficial mycoses, dermatophyte ecology, and the morphology of annular eruptions on the chest and abdomen. It also fits patient education handouts and clinical guidelines illustrating where to sample for microscopy and what clinicians mean by an “active border” in ringworm. Anatomical accuracy verified by SciePro's Medical Advisory Board.