Sweat patches, scientifically named lichen planus, is a chronic superficial fungal disease caused by Malassezia, which usually has no feeling. When the scope is larger and more serious, there may be slight itching, hypopigmentation or deepening, accompanied by furfuraceous flaky patches as the characteristics, preferably in the trunk and other parts of the sweaty parts, more serious in the summer, so it is called sweat patches. Some of them will be relieved and subside in the fall and winter seasons, and then recur in the summer of the next year. For the systemic eruption that is not cured for a long time, you can choose fluconazole or itraconazole as appropriate for internal use, and the general treatment is more than fourteen days. Mild can be only local treatment, you can use bifonazole cream or terbinafine ointment and ketoconazole shampoo, topical application in the bath.