This red bump -can- be Herpes. It can also be a million other things. Your best bet is to get a blood test (specifically for herpes, and specifically for your blood type) and to see a doctor for an informed opinion.
If you've had sex with someone and have any reason whatsoever to think it -might- be an STD, you should just get tested for everything, just to be sure. DON'T JUST ASSUME THAT IT'S SOMETHING MINOR. I did that for years, only to find out that I had herpes. I thought it was a rash or jock itch that I'd occasionally get. Living with it is hard enough. Knowing you may have spread it is worse.
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