Diagnosis of Tinea Corporis Clinical evaluation Potassium hydroxide wet mount Differential diagnosis of tinea corporis includes Pityriasis rosea Drug eruptions Nummular dermatitis Erythema multiforme Tinea versicolor Erythrasma Psoriasis Secondary syphilis Treatment of Tinea Corporis Topical or oral antifungals (See table: Options for Treatment of Superficial Fungal Infections *.)