If you or someone you know has ever dealt with an underarm rash, feeling concerned is natural. In this article, we'll discuss ...

Medically reviewed by Casey Gallagher, MD Armpit rashes can be caused by allergic reactions, infections, and chronic ...

Heat rash — also known as prickly heat, summer rash, or wildfire rash — occurs when the sweat gland ducts become blocked with sweat. Cooling or gently patting the rash may provide some relief.