I recently had sex with my girlfriend. I felt a vibration through my penile tube for about two weeks after that would occasionally occur. However, everything felt and looked normal. We had sex again throughout this period. However, the last time she also gabe me oral sex. Two days later I noticed my penis looked like it had swollen right below the head and it itches. It then developed over the next few days into a rash that slowly darkened in color from red to a reddish/purple. Only on the left side of my penis, and it spread up to the left side of the head of my penis. Then within the week the rash began to have skin peel off and it looked like it was turning into a lesion. I went to my doctor and was tested for chlamydia, gonorrhea, and syphilis. The results came back negative. My girlfriend was tested as well and her results were also negative. While I was waiting for the results my doctor prescribed me suprax and doxycycline. Neither of these medications improved my condition and it continued to slowly worsen. So I went to the emergency room and they prescribed me zithromax. After taking the 5 day course I saw about a 80% reduction in my symptoms. I therefore thought it was going away. However it has been two weeks since then and it appears to be swelling again and returning to its previous state. I am now very concerned since no one seems to know what it is and it gets painful. I have had empitigo before and it looks similar but not the same. Can anyone please help me?