PITYRIASIS VERSICOLOR   (TINEA VERSICOLOR)-Fungal infection  DEFINITION This is a mild, chronic infection of the skin caused by Malassezia yeasts, and characterized by discrete or confluent, scaly, discoloured or depigmented areas, mainly on the upper trunk. CAUSATIVE AGENT Pityrosporum ovale and P. orbiculare Malassezia furfur Colonization by these species is especially dense in the scalp, the