popped out of nowhere last time i had sex was 5 days before unprotected image was taken the first day it appeared has got much better now

popped out of nowhere last time i had sex was 5 days before unprotected image was taken the first day it appeared has got much better now

anyone know??
any pain?
it can also be like heat rash although the cluster appearance seems like herpes. but if it resolved in a day then its maybe unlikely.
started to clear up head of the penis is clear now but i do have a few pimples formed