Cause Of Acne.
More On This Topic: Hidradenitis Suppurativa Surgery Sometimes the skin cells will form together and cause the pores to clog up. The bacteria in the pores are what will cause swelling and this is what brings on a pimple. When the bacteria start to break down that is when you see the pimple start to form on the skin. There are many types of pimples and there are different causes