Cutting the nails too deep swelling and pain when touched may be inguinitis, can be sterilized with iodine povidone, topical ichthyol ointment, or physical therapy, oral cephalosporin is needed when necessary, and there is an abscess formation requires surgery. Inguguinitis is a purulent bacterial infection that affects the nail grooves on both sides of the nail as well as the surrounding tissues. There are many causes of onychomycosis, the common ones being cutting the nail too deeply, puncture wounds, contusion, reverse peeling and so on. Typical clinical manifestations of onychomycosis include localized redness, swelling, heat and pain, etc. Pus can appear in the subcutaneous area of the nail groove after suppuration, and finally form a semi-circumferential or even subnail abscess. 1. In the early stage of nail fissure infection, you can disinfect the nail fissure with iodophor, once a day, each time disinfecting 2~3 times. 2. After disinfection, you can use topical ichthyol ointment or golden yellow loose paste and other treatments. 3. Physiotherapy such as ultrashort wave and infrared ray can also be carried out appropriately. 4. If the infection is more serious, oral antibiotics, such as cefadroxil and cefazolin, can be taken under the guidance of the doctor. 5. If an abscess is formed, surgical treatment should be carried out with incision and drainage, and nail extraction is needed if a nail root abscess is formed. If you have any of the above symptoms, please go to the hospital in time, follow the doctor’s advice to choose the appropriate treatment, and the drugs should be applied under the guidance of the doctor.