Body Opponent Bag Toronto Swollen Knuckles From Punching Body Opponent Bag?

Swollen Knuckles from punching Body Opponent bag? - body opponent bag toronto

I have been in Hapkido and last week the holes in the bag is shaped like a man. Well, a week later, is one of my hands really hard and my joints are swollen. The skin is cracking my knuckles. How did it happen and what should I do?