Swollen fingers from crayfish are recommended to be sterilized with povidone-iodine and treated with antibiotics depending on the degree of inflammation and infection. After the hand was injured by the crayfish, first observe whether the pinched area has rupture or bleeding. If there is no skin rupture, pain is recommended to use cold towels for wet compresses, if necessary, take ibuprofen and other drugs for pain treatment. If there is a rupture of the skin of the pierced wound, it can be sterilized with iodine povidone and injected with tetanus antitoxin to prevent the occurrence of tetanus. When swelling occurs at the site of the later stabbing, it is considered that there may be infection, and it is recommended to first carry out local debridement, keep dry and clean, use iodine povidone for disinfection, debridement, and take out the foreign body in time if there is any foreign body. Then change the medication regularly, and take amoxicillin, cefaclor and other antibiotics to prevent infection.