Tinea versicolor is a type of dermatomycosis that is caused by a yeast that interferes with normal tanning. Dermatomycosis is a term that includes a variety of superficial skin infections caused by fungi or yeast. These types of infections almost always only affect skin, hair, and/or nails. In people with severe immune problems, these infections can become more serious and invasive.
Tinea versicolor can result in uneven skin color. Tinea versicolor usually affects the back, upper arms, underarms, chest, and neck. It rarely affects the face.