Medically reviewed by Casey Gallagher, MD Acne is a common skin condition that affects up to 50 million Americans each year.

A mum claimed a "dirty hot tub" on a birthday getaway caused an "absolutely wild" rash. Francesca Newton visited a lodge in North Wales to celebrate her 40th birthday with friends.

Sometimes, however, an armpit rash is severe enough to require a trip to the doctor. Learn symptoms of an armpit rash, what causes it, how it’s diagnosed, and treatment options.