Besides the face and back, it can also appear on the chest, neck, shoulders, and upper arms. During the healing process of acne, permanent scars and dark spots may appear on the skin.
Acne is the clogging of skin pores caused by dead skin cells. The body sheds dead skin cells after they rise to the pore's surface. However, when the body produces a lot of oil, it prevents the skin from drying out. As a result of the oil, dead skin cells stick together inside the pores instead of rising to the surface.