Have you ever seen this before?

I know this isn't related to babies but a couple of days ago my boyfriend and I went to the lake and when we got back in the car to go home, he saw this and popped it lol (yes he's one of THOSE boyfriends lol) we got home and it was still hurting which I thought was kind of weird. But now a few days later it looks like this and it hurts to touch. Has anyone else had this happen or know of a way to help?