I had an ache in my left testicle for around a week. I decied to vist the docter who questioned me about my sexual activity and suspected clymidia. I havent had any new sexual partners for 4 years now. At the time i had no other symptoms than the aching feeling in my testicle. She prescribed doxycillin and put the aching down the an infection, orchitis I think. I complete a urine sample the next day to test for clymidia, i am awaiting the test results this Friday Ive been taking the antibiotics for almost a week now and my symptoms are changing and getting worse. I've developed a burning sensation in my urethra its on and off and can be quite sharp. I decied to have a look and from what I can see the inside of my urethra is dark and purple which isn't normal. There also seems to be a purple spot or marbley lump just inside the tip of the penis. A few questions; - could the antibiotics be making it worse? - what is the dark/purple lining & the marble looking spot in the urethra? - could this be an underlying STD/STI that i have had for years?