It is difficult to determine the exact cause of acne. Doctors have postulated many different and varying causes. What they agree on however is the fact that, first, hormones are a big part in the appearance of acne. In a person's teenage years, male hormones called testosterone are often overproduced by the body, causing the body's sebaceous glands to generate more oil. Dead skin cells combine with the oil or sebum in the face clogging the pores and resulting to comedones (whiteheads) or blackheads. Later on, these can aggravate and become painful pimples.
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The most severe form of back acne creates cysts deep within the skin, and these will cause scarring if they erupt. The common blackhead is not caused by dirt but by reaction of the infected sebum with the melanin in the skin to form a discoloration. A whitehead is simply an eruption of the pus on the surface, and these can be squeezed if you know how to do it properly.
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