Too much toenail clipping may cause onychomycosis, which can be avoided for a short period of time by avoiding strenuous exercise, disinfecting with iodine vapors, gauze bandage, and so on. Medications should be applied under doctor’s supervision. Cutting toenails too short may damage the surrounding skin. Near the nail groove, due to its deeper location, there are more staphylococcus aureus deposits than the body skin. Once the skin is damaged, it can easily lead to onychomycosis. In this case, first of all, you can avoid strenuous exercise, reduce the contact between the nail and the skin, reduce the chance of secondary skin damage, thus reducing the probability of infection. Secondly, use tincture of iodine + alcohol or povidone-iodine to disinfect the surrounding skin to prevent or control the infection; or directly apply mupirocin ointment, erythromycin ointment and other antibiotic ointment to prevent infection. After disinfection, you can use sterile gauze to wrap the wound to protect it, and wear shoes that are loose.