As the name implies, “sweat spots” are skin problems related to excessive sweating. Since most of them have no conscious symptoms and the onset is slow, they often go unnoticed. Here we will see what exactly is “sweat spot”? Furunculosis, formerly known as lichen planus, commonly known as “sweat spot”, is a superficial fungal disease caused by Malassezia infection of the epidermal stratum corneum. The disease is chronic, with mild inflammation, usually no conscious symptoms. 1, “sweat spot” manifests as round or irregular spots on the skin, shaped like soybean size, and gradually increase to the size of nail cover, ranging from gray, brown to yellow-brown, sometimes a variety of colors coexist, like flower spots. Longer ones are light colored spots. The surface has very fine granular scales, not very obvious, easy to scrape off. With time, the rash may increase and expand to the surrounding area, fusing with each other to form an irregular map of different sizes. The rash is non-inflammatory, with occasional mild itching, and has a chronic course, with the rash decreasing or disappearing in winter, but recurring in summer. This is not a major disease, but because the lesions are mostly bare skin, flowery, affect the beauty, making patients very annoyed. 2, it is worth noting that many people lack correct understanding of “sweat spot” and use drugs to apply it indiscriminately. What is “spot removal lotion”, “spot removal water”, regardless of the red and white together. Some people even apply “ringworm potion” and “ringworm ointment”, making a mess of the whole face and neck. There are even hormonal creams such as “Dermatoprene and Dermacare” that are not only ineffective but even lead to an increase in the spread of the rash, a situation often encountered in summer dermatology. Therefore, if you find sweat spots, don’t use drugs on your own, it is better to treat them under the guidance of dermatologists. 3. Although “sweat spot” is a skin disease caused by Malassezia infecting the epidermal stratum corneum, it does not develop under normal circumstances. However, once summer comes, people sweat more and their skin is greasy, so the disease can occur if they don’t wash often, change their underwear, or suffer from chronic diseases or malnutrition. Therefore, the best way to prevent lichen planus is to pay attention to skin cleanliness and hygiene, and to wash sweat stains in time after sweating. The use of surfactants such as soap to remove sweat stains and grease from the skin often after summer is beneficial in preventing the occurrence of lichen planus. Generally speaking, “sweat spots” can subside on their own after the cool autumn, but this is only latent, not self-healing, and patients with long-term sweat spots are likely to have hypopigmentation spots, which may recur in the hot days next year. For small area, you can use 2% ketoconazole lotion or 2% selenium disulfide lotion for cleaning, and topical application of bifenbendazole cream, miconazole cream, ketoconazole cream, econazole cream, pay attention to the long course of treatment, at least two weeks continuously, the efficacy is better. As sweat spots are difficult to cure and easy to recur, repeat the medication intermittently to ensure the eradication of the infection. For patients with larger area or recurrent attacks, oral treatment with azole drugs such as itraconazole can be given. 5, here need to be reminded: not all skin spots are sweat spots, sometimes also need and vitiligo, anemic nevus, pityriasis rosea, ringworm, etc., these need the guidance of professional dermatologists. 6, there are also, many patients friends always worry about whether the disease will be contagious, sweat spot is caused by Malassezia superficial skin chronic fungal infection, the fungus under normal circumstances in the skin parasitic, in special circumstances cause disease, do not exclude sweat spot will be contagious, but with personal susceptible body. Personal items are supposed to be used separately, and in general, they are self-infectious and rarely infect others. It is also possible to get infected with the disease by wearing the clothes of a person with lichen planus. In addition, heavy laborers, welding operators, and athletes usually sweat a lot and are susceptible people, and are more likely to be infected with the disease.