Most people call these Acne comedones pimples. Small comedones, microcomedones also know as papules, form from contained cellular reactions that cause acne. They mostly occur in clusters too small to be seen by un aided eye. Pustules, nodules and cysts can form in stern form of acne. A pustule is a comedone full of pus or dead cells making it larger in size. Nodules are relatively hard, roughly spherical and more severe form of papules that extend in to the tissues forming a lump under the skin. It pains much when it is touched. Cysts emerge from pustules or the nodule but are fluid filled.
Mainly during puberty, glands in the face have an unusual chemical reaction which causes lots of sebum which simply catches dirt and oil and dead skin cells causing acne. Because the oils can't get out of the skin then they all gather up together and create a white head (the spots that stick out of the skin). With this in mind a blackhead has the same sort of theory however its the gathering of dead skin cells.
There is no specific factor that's responsible for causing back acne. According to medical studies, back acne occurs when sebaceous glands function aggressively during puberty. During this period, the male hormone group gets active and work towards producing extra sebum via stimulating sebaceous glands.
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