Acne is triggered during the adolescent stage when hormones stimulate the
sebaceous glands into producing and secreting oil that seeps through the openings in the skin. When openings are blocked, oil builds up underneath the skin causing bacteria to thrive happily on oil. It then multiplies which cause tissues to be inflamed. There are different sets of inflammation. When it is on the surface it's a pustule, but when it's deeper you call it papule (pimple), then a little deeper, it becomes a cyst. If the oil reaches and breaks out to the surface,it becomes a white head, which changes to a blackhead when it is oxidized.
