Armpit rashes are common in summer and require a combination of remedies and treatments Here’s what an expert has to say ...

Other treatment options include ... They may also take a skin biopsy or culture the rash. Intertrigo is a rash caused by friction, moisture, and decreased ventilation between two areas of skin.

Medically reviewed by Susan Bard, MD Some causes of underarm rash include infection, allergic reaction, and inflammation.