Medically reviewed by Casey Gallagher, MD Armpit rashes can be caused by allergic reactions, infections, and chronic conditions. Armpits are a common place to get rashes because the skin there is thin ...

If you apply pressure to the skin, but this time the rash does not disappear ... that bend like the inner elbow, wrists, and behind the knees, although it can also show up on the neck, face ...