I've been suffering from this for last 3 days HELP PLEASE!

Last time I had unprotected sex was a month ago since Thursday there was itching and now it has inflamed and there is weird red vein like mark which I think is expanding I am applying vaseline but its very itchy and sensitive even to cotton pants or boxers !

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anyone?

I got tested for syphilis antibodies and that came non-reactive no there aren’t any white spots or blisters that might indicate herpes!