Thumbnail bulge may be ringworm, psoriasis, perinail warts and other diseases, need to be based on the specific cause of the disease, under the guidance of the doctor to use antifungal drugs, glucocorticoid hormone drugs, physical therapy, etc. to improve. 1. Onychomycosis: fungi invade the nail plate layer of the thumbnail, destroying the normal structure of the nail plate layer and causing abnormal nail growth, hypertrophy and bulging. It can be treated with oral antifungal drugs such as terbinafine and itraconazole as prescribed by the doctor. 2. Psoriasis: psoriasis is caused by genetic factors or abnormal immune response, which can cause nail bulging when it involves the nails. Clobetasol propionate cream, tacrolimus ointment, tazarotene cream and other medications can be used for treatment. 3. Periungual warts: Periungual warts can be caused by human papilloma virus infection of the skin around the nails, and the growth of warts can lead to raised thumbnails. They can be treated with localized fluorouracil ointment, imiquimod cream and other medications, or removed through physical therapy such as liquid nitrogen cryotherapy and laser therapy. In addition to the above factors, it may also be caused by other reasons, it is recommended to consult a professional doctor in a timely manner, the specific use of medication need to follow the doctor’s instructions.