(Feel free to diagree anybody) but, I have had that before, it hurts reallll bad, but after it heals it seems like you can punch harder. I have huge knuckles now (from being drunk and punching shit like brick walls). I have read it can really damage your nerves and knuckles, so pay attention to that, I may just be lucky. But honestly, despite all known knowledge, I would say punch hard shit and **** up your knuckles, it will heal on their own and make it stronger. On the other side, don't listen to me dude, who knows more, me or doctors?!
I'm glad I could give you an 100% answer.