Sweat patches, also known as lichen planus, are superficial infections caused by Malassezia bacteria that invade the stratum corneum of the skin. There is no effective prescription for sweat patches, and it is not possible to blindly adopt the prescription for treatment, and it should be reasonably treated with appropriate medication under the guidance of a doctor. 1. The disease is mainly caused by Malassezia infection, mainly external drug therapy, can use antifungal topical preparations, such as ketoconazole cream, miconazole cream, clotrimazole cream and other drugs for external treatment, or ketoconazole lotion external wash, can play a role in inhibiting seborrhea and antifungal activity. 2. For patients with generalized rash and severe systemic symptoms, oral medications can also be used, such as common itraconazole, fluconazole, etc., which can inhibit the role of Malassezia. However, these drugs have certain side effects and have certain damage to liver function, so during treatment, liver function needs to be monitored. 3. Secondly, the disease is mainly induced by excessive sweating and exuberant oil secretion, so it is necessary to pay attention to personal hygiene, bathe and change clothes diligently, which can effectively reduce the recurrence of the disease. The discovery of lichen planus should be timely consultation, the use of specific drugs need to be under the guidance of a professional doctor.