Spots usually start to appear when your body is changing during puberty. Hormones cause your skin to produce too much oil, which blocks up your pores. When a pore gets blocked, bacteria inside start multiplying. This irritates the pore and causes a spot to form. Many people with acne might suffer from spots on the back and chest. Treat the face with Acnecide Gel and the body with Acnecide Wash.