Acne and acne scars are more common in those with oily skin and can appear anywhere on the body where there are microscopic hair follicles and skin pores (excluding the palms of the hands and soles of the feet). Acne most commonly appears on the face and upper body regions such as the back, chest, and shoulders. The pores in these places are numerous, and excessive oil production makes the skin greasy and contributes to acne formation.