Possible causes of pimples on eyebrows include folliculitis and acne. 1. Folliculitis: related to bacterial infection, trauma, decreased immunity, etc. are triggering factors for folliculitis, the clinical manifestation is a red papule or papule pustule centered on the hair follicle, accompanied by itching, pain and other symptoms. 2. Acne: is a kind of follicular sebaceous gland chronic inflammatory disease, mostly seen in adolescent people, and the body’s hormone level is closely related to the sense of Propionibacterium acnes, follicular sebaceous gland duct keratinization abnormality is also the main cause of its pathogenesis, the clinical manifestations for the affected areas of the skin appear pimples, papules, pustules, and so on. It is recommended that people with related symptoms should go to the dermatology department of the hospital for examination in order to make a clear diagnosis, so as to carry out targeted treatment.