Rash on neck, sore throat after sex with fwbs?

So I had sex with my fwbs recently. Two days later, I developed this super itchy rash on my neck. My glands in my neck are also swollen, and I have a sore throat. We are having unprotected sex right now, but he told me that he has not been with any other girls, and I'm the only one. Should I be worried?


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