The cause of acne is not yet fully understood. It is considered to be related to heredity, sebum overproduction, androgen levels, abnormal keratinization of follicular sebaceous gland ducts, and proliferation of Propionibacterium acnes. 1. Heredity: Both parents or a single parent often have acne, which is influenced by genetic factors, and their children may also have this condition. 2. Excessive sebum secretion: When you enter puberty, the hormone levels in your body change, such as excessive secretion of androgens and sebaceous glands, resulting in a large amount of oil secretion and clogging of hair follicles, which can easily induce acne. 3. Androgen levels: Higher androgen levels and abnormal androgen receptors in the body will affect sebum secretion, leading to increased sebum secretion, which may also induce acne. 4. Abnormal keratinization of follicular sebaceous gland ducts: Abnormal keratinization of the follicular opening leads to blockage of the ducts, which will affect sebum secretion and make it easy to form pimples and acne. 5. Proliferation of Propionibacterium acnes: Acne is mainly caused by pathogenic bacteria, such as the proliferation of Propionibacterium acnes, which breaks down sebum and produces inflammation, resulting in a localized inflammatory reaction. In addition to this, poor lifestyle, skin care practices, occupational exposures, illnesses, medications, and other factors may also contribute to the appearance of acne on the skin. If skin damage such as many pimples, papules, pustules, etc. appear on the skin, it is recommended to go to the dermatology department of the hospital in time and treat it with the above advice.