Some common skin infections may show up as an armpit rash. Tinea corporis is commonly called “ringworm," but it's actually a skin infection that's caused by a fungus, not a worm. There are ...

The cat mainly stays in the patient's room. He denies any outside activities. Tinea corporis is a superficial fungal infection involving the body and face, with the exclusion of the beard area in men.

Dark underarms may simply have to do with pigmentation and levels of melanin in the skin. But sometimes armpit discoloration is a sign of a health condition. Learn more here.