Hello I share your concern Looking at your description This might be related to infection or inflammation following sex I see patients with similar complaints routinely and I will definitely help you inbest possible way. I would advise you for battery of tests like blood for hemoglobin, CBC Liver function test and blood sugar test, urine culture as well as testing for STIs like VDRL and serological tests You may require a course of antibiotics or antiviral under supervision of doctor. meanwhile wash it antiseptic solution or soap and keep it clean and moist. If you can write back to me with more relevant information I will be able to tell you.more precisely Best wishes