Hi, It is difficult to determine the exact cause of the lump without a physical examination and medical evaluation. However, there are several possible explanations for a small painful lump on the urethra. One possibility is a cyst or abscess, which can develop in the glands around the urethra. These can be painful and may require medical treatment, such as antibiotics or drainage. Another possibility is a sexually transmitted infection (STI), such as genital warts or herpes. These can cause small bumps or lesions on or around the genitals, including the urethra. It is important to get tested for STIs and receive appropriate treatment if necessary. Less commonly, a small painful lump on the urethra may be a sign of a tumor or cancer. However, this is relatively rare and would require further medical evaluation and testing, such as a biopsy or imaging tests. It is recommended that you schedule an appointment with a healthcare provider, such as a urologist, for a physical examination and diagnosis. They can provide you with appropriate treatment options based on their findings. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician