Case 2: Tinea corporis
A potassium hydroxide(Drug information on potassium hydroxide) evaluation confirmed the diagnosis of tinea corporis; one of the animals on the farm was the most likely source of the dermatophyte infection, B. A 1-week course of terbinafine(Drug information on terbinafine) coupled with application of a topical antifungal cream eradicated the rash. Polymorphous light eruptions and cutaneous lupus typically consist of erythematous patches and plaques that are more inflamed than the rash seen here. Actinic keratoses are more keratotic and are not pruritic. A contact dermatitis to his watch is possible, but the distribution of the rash does not match the area of skin exposed to his watchband.