Picture of Pityriasis Versicolor
Pityriasis versicolor. Pityriasis versicolor is a common skin disease caused by yeast-like fungus (Malassezia furfur). The fungus interferes with the normal pigmentation of the skin causing patches of discoloration, usually on the main trunk of the body and shoulders. It can be treated with antifungal creams, lotions, and soaps.
Text Source: Mayo Clinic