The cause and pathogenesis of acne has not been fully elucidated, and is related to genetic factors, exuberant secretion of androgens, keratinization of follicle sebaceous ducts, propagation of Propionibacterium acnes, and bad habits. 1. Genetic factors: acne and genetic factors are also related to a certain extent, one parent suffering from acne, the next generation is more likely to suffer from the disease. 2. Excessive secretion of androgens: Excessive secretion of androgens in the body will induce sebaceous glands to secrete, thus triggering acne. 3. Keratinization of follicular sebaceous gland ducts: Stimulation of follicular sebaceous secretion may lead to hyperkeratinization of follicular sebaceous gland ducts, resulting in acne. 4. Propionibacterium acnes reproduction: The growth and reproduction of microorganisms such as Propionibacterium acnes within the hair follicle can cause an inflammatory reaction, which can also lead to acne. 5. Bad habits: Smoking, drinking alcohol, eating spicy, sweet, and overly oily foods, as well as lack of sleep, nervousness, and anxiety are also among the triggers. There may be other reasons for acne on the top of the head, you need to go to the hospital in time to check the cause.