Sweat spot, also called lichen planus and pityriasis pilaris, is a superficial infection caused by Malassezia invading the cuticle of the skin. The treatment of this disease should be diligent in bathing, changing clothes, and underwear should be disinfected by boiling or sun exposure. This disease is mainly topical treatment, you can choose a variety of antifungal topical preparations, such as bifenazole solution, miconazole cream, clotrimazole cream, amorolfine cream, etc., the course of topical drugs is generally 2-4 weeks. 20%-40% sodium thiosulfate solution, selenium disulfide lotion, 2% ketoconazole lotion topical also has a therapeutic effect. For those with large lesions and poor results with simple topical application, oral antifungal drugs such as terbinafine and itraconazole can be taken.