It is not uncommon to think of blackheads as dirt that clings to the pores. In fact, blackheads occur because the pores are full of bacteria and oil, then turn darker when exposed to air. Although blackheads most often appear on the face, but make no mistake, because blackheads turned out to also appear on the back, shoulders, chest, neck, and arms. Recognize Various Causes of Blackheads Blackheads occur because of the blockage of sebum (oil) and dead skin cells that have hardened, and appear prominent and dark in color due to exposure to air. Blackheads are also called open blackheads, because the skin on the lump has been opened, in contrast to white blackheads whose bumps are still closed to look white. There are several factors that trigger the appearance of blackheads, including: Sweating a lot There is irritation to the hair follicles. There is a buildup of Propionibacterium acnes bacteria on the skin. Experiencing hormonal changes that cause an increase in oil or swea