Medically reviewed by Casey Gallagher, MD Fact checked by Khara Scheppmann Armpit rashes can be caused by allergic reactions, ...

Piracha, MDPossible causes of armpit pain range from the minor irritation of clothing, or an infection that goes away quickly, to serious medical issues such as swollen lymph nodes and cancer-related ...

"Having a big red splotch on your arm for a couple of days may not be fun, but the reality is there's no need to panic and no reason not to get your second shot." Brown's rash subsided after a few ...