Folliculitis is an infection caused by fungus or bacteria that affects the hair follicles. It is most common on the face, scalp, thighs, and groin. It looks like a small pimple and may itch or burn. Though it usually subsides on its own, your doctor may recommend an ointment to speed healing or manage pain. Follow the links below to find WebMD's comprehensive coverage about how folliculitis is caused, what it looks like, how to treat it, and much more.