Hello I appreciate your concern This could be due to infection like STI or allergic reaction I would like further information to help you better Your age and relevant medical history like diabetes or liver disease Recent exposure to unprotected sex? In my opinion you should consult a VD and skin specialist for physical check up and a battery of tests like urine culture, VDRL and blood profile to rule out infection Meanwhile please follow these guidelines Have plenty of fluids Apply antiseptic or antibacterial ointment after cleaning it Maintain good hygiene Use condom during sex Hope this answers your question Best wishes