What can be used to treat a fungus that causes skin discoloration?

Antifungal medicine. Fungus infections of the skin usually change the skin color, but after a few to many months, the color should be back to normal. Common "ringworm", jock itch, or athlete's foot rashes are treated with over-the-counter lotriminaf cream. Tinea versicolor rash on the back and chest is treated with selsun blue shampoo. A doctor can check to be sure the rash is fungal, and give details on treatment.
Tinea Versicolor. Treatment of tinea versicolor with topical antifungals. Topical antifungal medications are the treatment of choice for tinea versicolor. The following topical antifungal treatment regimens have been shown to produce a greater than 70% clinical response rate: 2% Ketoconazole Cream applied once daily for 11-22 days, 2% ketoconazole shampoo regimen (lathered over affected and surrounding areas).