Bumps under the skin at the pubic hair may be diseases such as folliculitis, condyloma acuminatum and vulvar cysts. 1. Folliculitis: the cause of the disease is mainly related to pathogenic bacterial infection, plucking hair, rubbing the skin and other factors may also induce the disease. The patient will appear locally with red papules centered on the hair follicle, and folliculitis may appear in any part of the body where there is hair. 2. Condyloma acuminatum: the cause of the disease is mainly related to human papilloma virus infection. The patient will have multiple or single small light red particles, cauliflower-like, papillary, etc., which can be seen in the perineum, perianal and other parts of the body. 3. Vulvar cysts: the etiology may be related to blockage of glandular ducts, surgical trauma, abnormal tissue development, etc. Patients will have painless lumps in the perineum. There are more diseases that cause lumps under the skin at the pubic hair, so it is recommended to go to a regular hospital to clarify the cause.