21 male, sexually active. So about months ago I started noticing a burning feeling along the inside of my foreskin, and sometimes the inside of my urethra. I've never had any blisters or scabs, just some redness from time to time. It's been 7 months though and the burning hasn't gone away. Sometimes it will subside for a day or two, but has never gone away more than like 3 days. A couple doctors said they didn't think I had any stds, and I was tested for the normal panel and came back negative. Then, about 3 weeks ago I noticed a red mark on my penis head. It hasn't hurt, blistered, or scabbed, but it also hasn't gone away. Any ideas? The pictures are in the link below http://imgur.com/a/az34XKU
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