A whitehead bump on the left side of the urethra in a 57-year-old woman may be caused by sebaceous gland duct blockage, folliculitis, warts and other factors. 1. Sebaceous gland conduit blockage: infrequent cleaning of the lower body, resulting in sebaceous gland conduit blockage on the left side of the urethra, which may cause the local appearance of whiteheads and small bumps, usually with no self-conscious symptoms. 2. Folliculitis: poor hygiene of the lower body may lead to infection of the hair follicles, resulting in folliculitis, which may cause localized whiteheads, accompanied by itching, tingling and other symptoms. 3. Condyloma acuminatum: a sexually transmitted disease, usually caused by human papilloma virus infection, can make the pubic area and the urethral opening next to the appearance of white or red bumps, and the area will gradually increase, presenting a vegetable pattern. A white head on the left side of the urethra and other abnormal symptoms should be alerted to disease factors, it is recommended to consult a doctor for examination and treatment.