Tinea versicolor, clinically known as pityriasis versicolor, is a fungal skin rash caused by an overgrowth ... scaly patches ...

Other causes of an armpit rash include a yeast infection, psoriasis, or seborrheic dermatitis. Rashes are pesky patches of irritated skin that can affect any part of your body, including your armpits.

If the rash persists, it may be due to a fungal infection, as these tend to thrive in warm, moist areas. Treat with an anti-fungal cream, such as Daktarin, twice a day. If neither of these ...

Jock itch is a common fungal infection ... A stress rash is characterized by hives or welts on the skin. While they usually appear on the face, neck, chest, and arms, the bumps can break out ...