Help!?! Razor burn? From friction from sex? From my UTI? Or worse?

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I have bumps on my vagina and between my butt cheeks. They showed up after me shaving and then wearing a dress with out underwear. but I also have a UTI & sex with a new partner he didn't have any kind of spots or bumps on him. please help!

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i would visit the doctor alot of things can cause that