i used to do that before.. you have to keep punching the bag..
wear wraps.. and cover your knuckles..
keep hitting it and it wont do it anymore.. it's just like that homie.. you have to enjoy it until it's gone..
soon you wont need wraps like me i can wack the bag without gloves.. dont have to be chuck norris. any gloves in this style..
i recommend..
i use these type of gloves.. they have a tight strap for your wrists... so that when you punch you wont twist your wrist and it protects your knuckles..
these gloves are bad!!
try them