The method of removing a splinter from the inside of the foot is determined by the depth of the splinter and whether it is exposed or not. For superficial thorns, a needle can be used to pick out the thorn, while deeper thorns need to be removed by incision if necessary. For partially exposed spines, extraction is sufficient, while non-exposed spines need to be removed by incision and exploration. 1. The depth of the stinger: clinically, for the stinger’s location is superficial, you can choose to use a sterile syringe needle to slowly pick through the surface of the skin, exposing the stinger’s location after picking out. However, if the location of the stinger is deeper and cannot be removed, it is necessary to cut the surface skin under local anesthesia and remove the stinger after separating and exploring the location of the stinger. 2. Whether the splinter is exposed or not: for those with partially exposed splinter, regardless of the size and depth of the splinter, the exposed part can be clamped with hemostat and pulled out. For those with no exposure of the stinger, the stinger needs to be removed after incision and exploration of the stinger’s location. Because the removal of thorns is invasive and prone to infection, it is recommended to go to the hospital to be operated by a professional physician, and those with a deeper location need to be injected with tetanus antitoxin or tetanus immunoglobulin to prevent tetanus.