I have also deeply experienced the sting of chestnuts. But you don't have to worry too much about this. The thorns of chestnuts are relatively small, not very deep. Generally, the thorn that penetrates the human body is the tip of chestnut needle1-3 mm. It won't cause fatal injuries, and it won't threaten your life. You can disinfect the needle with alcohol and carefully pick out the thorn, then wipe the wound with alcohol, or you can directly wipe the puncture with alcohol. The skin will naturally "expel" the sting for two to three days. I won't say the technical terms, because chestnut thorns don't interact with human skin and muscles, and it is impossible to grow. When skin cells grow, they will expel foreign bodies, just like dead hair, which will naturally fall off. Or the needle sterilized with alcohol will come down as soon as it is picked.