A 30 yr old female presents with history of itching under right breast. On examination annular ring lesion was present under the breast. The diagnosis is

Tinea Corporis (Tinea of trunk and limbs) * T. rubrum most common; may spread from fungal infection of feet (T. rubrum, T. mentagrophytes), infected animal (M. canis), or soil (M. gypseum). * Presents as erythematous, sharply marginated, scaly plaque with raised, advancing border; typically with central clearing and annular or arcuate shape. Clinical variants :- * Tinea imbricata: T. concentricum, presents with distinct scaly plaques arranged in concentric rings * Tinea profunda: marked inflammatory response to a dermatophyte (analogous to kerion on scalp) * Tinea incognito: dermatophyte infection without obvious signs of inflammation (usually due to prior treatment with topical coicosteroid) * Majocchi's granuloma: T. rubrum (most common), granulomatous folliculitis due to dermatophyte entering hair follicles (usually due to prior topical coicosteroid use), treat with oral antifungal Treatment:- Topical therapy usually adequate (imidazole, allylamine); if extensive or involving hair follicles can use oral terbinafine or itraconazole. Ref:- Sima Jain; pg num:-227