Acne is a common inflammatory disorder of the skin. It usually happens when hair follicles which are there under the skin are clogged. Dead skin cells and Sebum (a type of oil that saves skin from drying) clog the pores. It will lead to unwanted lesion known as acne.
Usually we get acne on face. But apart from the face, they may also appear on the chest, back or even shoulders. Many times they remain as unwanted spots but they can even turn out to be nasty scars - a hindrance in your flawless looks.
People all over the world get acne irrespective of age or race. They commonly start appearing throughout puberty. Though males and females both can get acne, it is more common in males during teenage years. On the other hand, it is more common in women into adulthood.