1, superficial type: at first, it is often punctate, with irregular shape and uncertain points. Fungal infections are usually confined to the nail surface. It can be treated by topical drugs, such as Amo Lu Fen liniment, Terbinafine ointment, Sertaconazole ointment, or ointment containing salicylic acid and benzoic acid.

2. Subungual type: the whole nail can be gray, gradually turn yellow-brown until black, then the deck deteriorates, the nail bed becomes thicker, and the deep nail, including the nail bed and surrounding tissues, is infected by fungi. Because of the limited permeability of external drugs, it is difficult to treat deep nail tissues and tissues around nails. At this time, external medication alone can not achieve the therapeutic effect, so it is necessary to consider the combined use of oral drugs for treatment. Oral drugs such as terbinafine and itraconazole are usually selected for antifungal treatment in clinic.

In addition to drug therapy, if the symptoms are serious or complicated with paronychia, the diseased nail should be removed according to the doctor's advice, and laser therapy and photodynamic therapy can also be used to inhibit pathogenic bacteria and kill microorganisms.