The deformity of the toenail of the bunion is considered to be caused by onychomycosis, psoriasis, onychomycosis and other diseases, and the patient needs to take medication and surgical treatment for the cause of the disease. 1. Tinea pedis: foot bunion toenail deformity is considered to be caused by tinea pedis, the patient can be under the guidance of the doctor oral antifungal drugs, such as metronidazole, itraconazole, fluconazole, etc., or topical amorphophallus. 2. Psoriasis: foot bunion toenail deformity is also considered to be caused by psoriasis, the patient can comply with the doctor’s instructions for the use of topical glucocorticoid drugs, such as dexamethasone, dianabed, etc., or topical immunosuppressant drugs, such as tacrolimus, pimecrolimus and so on. 3. Trenchitis: foot bunion toenail deformity may also be caused by trenchitis, the patient can be guided by a doctor to use aluminum acetate solution, chlorhexidine solution, or topical mupirocin ointment, fusidic acid cream and other antibiotic drugs. Some patients may also take abscess drainage and nail extraction. There are many causes of foot bunion nail deformity, patients are advised to identify the cause of the disease in a timely manner, do not blindly use medication.