Why do i get like pimples under my atm pits, they really hurt and when i pop them blood vomes out of them very disturbing and imberrasing?

Folliculitis : Folliculitis is an infection in the hair follicles.Each hair on your body grows out of a tiny pouch called a follicle.You can have folliculitis on any part of your body that has hair.But it is most common on the face and scalp and areas rubbed by clothing, or in areas that are often shaved. Folliculitis looks a lot like pimples and you should see a dermatologist so they can prescribe you some meds.