When I Was Around 13-14 I Had A Boner So

When I was around 13-14 I had a boner so I put a pillow on it for whatever reason and I guess I must have pushed too hard because I felt a pain on my penis and I checked my pants and blood was coming out of the hole and I was panicking but the blood eventually stopped and now it's been like 3 years and I still have a purple-ish bruise on the head of my penis and I don't know if it will ever go away. Can you please tell me what happened to me and if there is anything I could do.