Pimples are medically known as acne, and the main causes are related to Propionibacterium acnes infections, etc. Vitamin A and anti-inflammatory drugs are available for treatment. 1. Causes of acne (1) Dietary factors: Acne is related to daily diet, for example, a diet high in sugar, dairy products, etc. may encourage the sebaceous glands to secrete a large amount of sebum, causing facial acne. (2) Hot environment: For example, in hot summer, the sebum secretion of the skin is vigorous, coupled with the frequent application of oily lotions or foundation creams, which may easily cause clogging of pores and induce the appearance of facial acne. (3) Propionibacterium acnes: Infection with Propionibacterium acnes can lead to localized inflammatory reactions, which in turn leads to the development of acne. 2. Treatment of acne (1) Retinoids: Topical creams of retinoids can be used to treat mild to moderate acne, which can improve follicular sebaceous gland duct keratinization, as well as dissolve pimples and other anti-inflammatory effects. (2) Anti-inflammatory: mainly including clindamycin gel, fusidic acid cream, etc., which can improve and kill Propionibacterium acnes and relieve the symptoms of facial acne. Acne is recommended to consult the dermatology department in the hospital and use medication under the guidance of the doctor, not blindly self-medication, in order to avoid adverse effects.