Sweat patches are referred to as lichen planus, which is a superficial infection caused by Malassezia violating the cuticle of the skin. External washing with sulfur soap has no therapeutic effect, and antifungal treatment is generally required. Sulfur soap belongs to a kind of daily products, is a kind of soap containing sulfur, to a certain extent, can play the role of insecticide and anti-itching, some skin diseases have a certain degree of prevention and auxiliary therapeutic effect. Sulfur soap does not have a particularly obvious antifungal effect, for fungal infections caused by various types of diseases without therapeutic effect. Sweat spot is the common name of lichen planus, which is a superficial fungal infectious disease, in the treatment of the need to choose antifungal drug therapy, such as topical naftifine ketoconazole, oral itraconazole and so on. After the appearance of lichen planus on the skin, it is necessary to consult a doctor in time, under the guidance of the doctor to carry out standardized treatment, not blindly believe in the prescription.