Widespread Tinea Corporis

Description

Across the anterior trunk of an adult male, multiple annular erythematous plaques spread over the chest and upper abdomen, many with a raised scaly border and partial central clearing typical of tinea corporis (ringworm). Several lesions coalesce into polycyclic configurations, creating broader inflammatory fields over the pectoral region while smaller satellite rings remain scattered more laterally. Scale is most conspicuous at the active peripheral margin, where dermatophyte growth extends centrifugally through the stratum corneum. Distribution favors the somatic surface rather than intertriginous folds. Widespread dermatophytosis on the trunk changes how you approach diagnosis and management, because extensive tinea corporis can mimic nummular eczema, pityriasis rosea, psoriasis, or even subacute cutaneous lupus when plaques become less distinctly ringed. KOH wet mount taken from the advancing edge (not the center) typically demonstrates branching septate hyphae, and fungal culture helps when prior topical steroid use has blunted scale and erythema (tinea incognito). Treatment decisions hinge on body surface area and host factors: diffuse plaques often warrant systemic terbinafine or itraconazole and a search for reservoirs such as tinea pedis, onychomycosis, contaminated athletic gear, or close-contact transmission. Extent matters. Use this asset in dermatology lectures on superficial mycoses, infectious disease teaching sets on dermatophyte infection, and patient-facing materials explaining why lesions enlarge centrifugally and why antifungal therapy targets the edge. It also fits clinical reference guides discussing differential diagnosis of annular plaques on the male chest and trunk. Anatomical accuracy verified by SciePro's Medical Advisory Board.