Medically reviewed by Casey Gallagher, MD Armpit rashes often develop due to allergic reactions, infections, and chronic conditions. Rashes are common under the arms because the skinfold creates a ...

This overgrowth of yeast can cause inflammation and a rash. Symptoms of a yeast infection on the skin of your armpit include: Bright red rash Itching Burning Spots that look like pimples How to ...