Sweat spots must be unfamiliar to many people because the disease is asymptomatic in most patients and not easy to attract patients’ attention, but the disease is very common clinically, and the youngest age of sweat spots on the head and face has been reported in China is more than 20 days after birth. Is sweat spot a skin disease caused by simple sweating? Actually, it is not that simple, so let’s get to know sweat spots together. Sweat spot, also known as pityriasis pilaris, was previously also known as lichen planus, is a superficial fungal skin disease caused by a fungal infection called Malassezia marcescens in the stratum corneum of the skin. The onset of the disease is often associated with excessive sweating, heat and humidity, malnutrition, chronic diseases (such as diabetes), pregnancy, and the application of glucocorticoids. The disease tends to occur in the hot summer months and shows a pattern of heavy summer and light winter. The lesions are usually found on the chest and back, shoulders, upper arms, face and neck, and often appear as round or irregular-shaped rashes of different sizes with clear edges, which may fuse with each other to form patches surrounded by scattered rashes, covered with light bran-like scales, which may be light white, light brown, light red, yellowish brown, etc. Sometimes, multiple colors may exist at the same time, resembling flower spots. The disease is chronic, most patients have no conscious symptoms, and occasionally have mild itching. Treatment: Usually you should bathe and iron your clothes. For small areas, topical antifungal preparations (such as sertaconazole cream, naftifine ketoconazole cream, etc.) can be used, and for large areas, oral antifungal preparations (such as itraconazole capsules, etc.) should be chosen, and topical 2% ketoconazole shampoo should be used to bathe the whole body.