Pityriasis versicolor is a fungal disease of the skin. The disease is usually harmless and free of symptoms, but the fungal infestation can be perceived as cosmetically disturbing.
It is caused by the yeast Malassezia furfur (old name: Pityrosporum ovale), a fungus that occurs naturally on the skin and does not normally cause any symptoms. In some cases, however, the fungus changes shape and begins to enlarge abnormally, creating a skin condition that is harmless to health but disturbing cosmetically. The yeast Malassezia furfur also plays a role in the development of dandruff and cradle cap.
The Kleienpilz lichen mainly affects men. Favouring development factors are heavy sweating and a humid and warm skin climate. The infection is not contagious.