Dear Doctor, I am really worried I might have a STD. After having unprotected sex with my girlfriend the first time, I developed a small skin colored lump on the right side of head of my penis, it is not painful it does not itch. The first time it showed up, it was really noticeable and I took pictures of it. It lasted about a week and went away...every now and then I can see it rise on the penis but then goes away within a few hours. I am really concerned because ever since, I have developed really bad pain in the glands around my neck. The glands in my neck hurt a lot a times, to the point that I get anxious, upset, really worried, among other things. Do you think I have a STD? I got tested for HIV, Syphilis, and Herpes, and all came back negative.