Persistent dermatophytosis refers to two main conditions: the first condition is psoriasis. Psoriasis, which can be classified as psoriasis or neurodermatitis. In clinical treatment, different protocols can be used. In the case of neurodermatitis, halomethasone ointment, applied twice a day, or fluticasone propionate cream, applied once a day can be used. If it is psoriasis, hydrocortisone butyrate ointment 1:1 mixed with carbotriol ointment can be used to apply the treatment, or you can apply Chinese medicine, such as centipede ointment to apply the treatment. The second condition is tinea corporis caused by fungal infection, and in clinical treatment, antifungal ointment, such as terbinafine hydrochloride cream, or naftifine ketoconazole cream, should be applied for treatment.