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Anonymous
If you are male and under 18, or female and under 25, there is a chance it may cause problems with your development.
Afterwards, if done properly, it will cause no more damage than increasing the bone density of your knuckles and giving callouses.
It is often done in martial arts as part of training for punches, since it requires proper arm position, and strong knuckles. If you want to know possible risks, you will find identical risks from using a Makiwara, or punching board. Just read about some of those risks and the evidence, and ask if you're willing to risk it.
Done safely, there is no permanent damage risk.
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