hi, about a month ago, i fell on my knee during soccer. but later on, a small bump formed on top. the top of the bump is hard, but when you push it, or when i accidentally brush it on something, it hurts. yesterday during my soccer games i fell when someone tackled me. then the entire bump was hanging off a tiny piece of skin. thejwas raw skin underneath the bump, and blood was pouring out from beneath. do you happen to know anything about this? thank you