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Expert Q & A Answers About baby oil lubricant

Do STDs ever develop on their own?

If I had sex with my girlfriend, and neither of us has a sexually transmitted disease (STD), can an STD form on its own? Also, I’ve had unprotected sex with my girlfriend using baby oil, and now I have little pimples or blisters on the bottom of my head of my penis. Could that be from the baby oil? Or could it be something else?