Hi. I'm gay and slept with this guy about 8 days ago. we had oral sex and he ejaculated all over my penis. now i have a bump on my shaft. it looks like a normal spot like acne ones i've always been getting on my back a lot and is painful when i touch it. it doesnt look like an ulcer though and ive had no discharge from it. However, i have a mouth ulcer too under my tongue but i get mouth uclers a lot anyway.
is this something serious?