When it comes to acne, it’s described as a chronic inflammatory disease of the sebaceous hair follicles. In each follicle, there is a tiny hair and multiple sebaceous glands. The sebaceous glands make an oily substance called sebum which travels up the hair follicle and out of the surface of the skin. But with acne, skin bacteria multiplies within the clogged pores and sebum is trapped within the follicle. The face scalp, neck, chest, back, and upper arms and shoulders are areas of the skin where sebaceous glands are most numerous and this is where acne will likely develop. Acne is common in the twenties or thirties but it typically begins in adolescence.