Why does the forehead grow acne

People often say that "acne," in medicine called "acne." Most of them are born in adolescents, because adolescent androgen secretion is exuberant, the sebaceous gland dominated by androgen will secrete more oil, oil accumulates at the opening of pilosebaceous gland, and forms an anaerobic environment, which is conducive to the proliferation of Propionibacterium acnes. After the oil is decomposed by Propionibacterium acnes, free fatty acid is produced to stimulate abnormal keratinocyte keratosis of pilosebaceous gland duct and block gland duct. Local immune inflammation, thus showing the skin lesions of acne. Sebaceous gland secretion exuberant parts are mainly located in the forehead, under the bar, nose and nose on both sides of the area, back, chest, etc., so the forehead oil secretion more, easy to grow acne.