Had oral sex 24 day ago, the day after what looks like a red pimple appeared, l did not think much of it but after a week it did not go away so I went and got tested everything came back negative, it's gotten bigger, it no pain at the first 2 weeks, I have very mild discomfort when i have an erection, no discharge and their is no fluid in the blister yet. Is this herpes, Hpv or something else?
Photos, Day after, second and third week, now.