Recently I've been intimate with a new partner. She told me she had been tested for herpes, but I'm not sure when. We had unprotected sex (regretfully, but briefly) a week or two ago. Since then we've limited it to oral sex. Recently I've noticed a small red spot about one centimeter from my urethra. It isn't raised, but it feels slightly irritated, and sometimes looks better/worse depending on the light. There's only one little spot and it's about a centimeter in diameter, no warts, no discharge, no pain while urinating, etc. It just feels slightly irritated (maybe a bit rough but that could be because I'm constantly worried/looking at it).
I only noticed this spot after masturbating in the shower (maybe a little aggressively), but it's been a few days and it comes and goes.
Sometimes I can barely notice it, and sometimes it's really bright red and looks like it's getting bigger, and it's really starting to worry me constantly. I also think I have anxiety issues so that's not making it any better.
I'm going to a doctor in a week or so (I'm at college, but finals end next week so I can go home), should I be worried that this is an STD, or could it just be irritated skin? I already know I have problems with eczema, but the skin on my penis isn't dry, and I've never had eczema near my penis before.
Any help is appreciated,
Thanks.