The most common type of swelling and pain next to the nails is onychomycosis. It is usually caused by an accidental trauma to the fingers or toes, resulting in localized wounds. As the wounds are not properly disinfected, bacteria can grow and multiply in them, thus leading to infection, inflammation, swelling and pain. If the situation is serious, there will be obvious inflammatory secretions in the nail grooves and places next to the nails, such as yellowish secretions or oozing yellowish-white pus, which must be strictly sterilized and bandaged to deal with this situation. If necessary, surgery is needed to completely remove the nail next to it, and then the tissue inside can only be completely cured after a thorough debridement. Usually pay attention to the hygienic care of the toenail, if there is damage, it must be immediately sterilized, avoiding water.