Hi - i would recommend you practice strengthening the small muscles of your hand and doing dexterity/flexibility exercises for at least as long as you puch the bag.

without assessing your hands, it is hard to say what might happen.

If you have poor ligamentous support for your hands, then it might be bad for you and injure your hands.

If you have good support and strength, it should be ok so long as your punching technique is ok

Without properly assessing you, it is hard to determine.

Cheers