Pimples on pubic hair may be caused by folliculitis, vulvar eczema, condyloma acuminatum and other diseases. 1. Folliculitis: the cause of the disease is mainly related to pathogenic bacterial infection, common staphylococcus aureus and so on. The patient will have localized pimples centered on hair follicles, which can be seen in any part of the body where there is hair. 2. Vulvar eczema: the cause is not clear, may be related to systemic diseases, allergies, environmental factors. The patient’s vulva will appear red spots, pimples, swelling and other symptoms. 3. Condyloma acuminatum: the cause of the disease is mainly related to human papillomavirus infection, low immunity, multiple sex partners and other reasons may also trigger the disease. The patient will be localized single or multiple small particles, papillary, cauliflower, etc., commonly in the perineum, perianal and other parts of the body, can also be manifested in the pubic hair of the pimples. There are more reasons for pimples on pubic hair, it is recommended to go to regular hospitals for examination to clarify the cause of the disease.