Enlarged pores on oily skin can be caused by acne, seborrheic dermatitis or rosacea, and patients are advised to improve the condition with specific medications under the guidance of a doctor. 1. Acne: Acne is easily caused when the oil secretion clogs the hair follicles and the pores become enlarged. It is recommended that patients should do a good job of skin cleansing, and at the same time can be used topical adapalene gel and so on to improve. 2. Seborrheic dermatitis: Seborrheic dermatitis is usually caused by exuberant secretion of oil and concurrent Malassezia infection, and can be treated with topical sulfur and salicylic acid to regulate oil secretion and anti-inflammatory. 3. Rosacea: Rosacea can be improved with topical benzoyl peroxide or antibiotic medications such as fusidic acid cream and clindamycin gel. Enlarged pores caused by the above reasons can be improved by using fractional laser, C6 and other photoelectric treatments, but only if the above infectious dermatoses are under control to avoid adverse consequences. Patients are advised to go to regular hospitals for the above mentioned conditions and treatments, and standardize the treatment under the guidance of professional doctors.