Enlarged pores in adolescent women can be caused by overactive sebaceous glands, incorrect skincare practices, excessive application of skincare products, and dehydration of skin cells. 1. Overactive sebaceous glands: Adolescent women are affected by hormones, sebaceous glands are more active, oil secretion, oil will stimulate the follicle sebaceous gland ducts, resulting in large pores, in order to smooth the discharge of oil. 2. Incorrect skin care practices: when caring for the skin, if you often squeeze pimples and blackheads, the skin is overstimulated, harming the dermis, which will lead to large pores. 3. Excessive application of skin care products: Improper skin care will lead to repeated stimulation of the skin, resulting in damage to the barrier, prone to acne, large pores and other phenomena. 4. Skin cell dehydration: by the influence of seasonal changes, the skin is in a dry and dehydrated environment, the skin lack of moisturizing, will cause the phenomenon of adolescent women with large pores. Life should pay attention to keep the face clean, do not use cosmetics that stimulate the skin, can have a certain effect on the skin to improve.