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 ...

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

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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 ...