Inverse pityriasis rosea usually causes a rash on the armpits, groin, neck, or face. The rash may clear up on its own, and medications such as antihistamines can help with itching. Inverse pityriasis ...
Armpit rashes can be caused by allergic reactions to deodorants or shaving creams. If products like deodorant cause a rash, you might be allergic to the fragrance or ingredients. Keeping the area ...