Although it is still May, the temperature all of a sudden to 37 ℃, people can not help but think of the cool mat, or take out the old mat in the cabinet idle for most of the year, or the purchase of a new mat. Enjoy the cool at the same time, some people also added trouble, what happened? It turns out that these people, the parts in contact with the mat or even the whole body rash, red and itchy, and even have ulcers, oozing …, this is what people call “mat dermatitis”. This mat dermatitis can be divided into the following cases: First, allergy: can be divided into two categories: one is allergic dermatitis caused by allergy to the material of the mat or allergic to its attachment, mostly belongs to contact dermatitis, occurring in the parts of the body in contact with the mat. As far as the material is concerned, the mat made of rope, reed and grass is easy to make people allergic, while those made of bamboo and rattan are less allergic; the attachments on them are mainly residues of detergents, talcum powder and insecticides. The other category is dust mite or mold allergy, which mostly belongs to type I allergic reaction, and the dermatitis is more than the part of the body in contact with the mat, and even involves other systems or organs. Human dander and dust easily invade into the cracks of the mat, coupled with the humid weather, so that dust mites are easy to breed and reproduce, their bodies are very small, not easily observed by the naked eye, generally not parasitic, do not bite people, feeding on human and animal body shedding dander and nutritious powdered food, its excrement and body fragments is a very strong allergen, some allergic people will come into contact with an allergic rash, and even sneezing, runny nose, inducing allergic rash. Runny nose, induce allergic asthma, etc. Also, the mold that grows on the mat can also cause allergic skin symptoms and even respiratory symptoms. Secondly, insect bites: there are often small insects hidden on the mat, such as mites. The mite is a kind of spider invisible to the naked eye, it is a very widely distributed parasitic mite, parasitic on insects that harm crops, is the natural enemy of these insects, they are not parasitic on human skin, but when contacting people bite human skin caused by insect bite dermatitis, also known as papular urticaria, generally congestive papules or erythema, linear distribution, rice grain to soybean size, the center can have small blisters. Mostly seen in cotton, cereal harvesters and packaging workers, but also due to the use of straw mats or straw mattresses and disease. Bites from other insects such as fleas and midges can also lead to dermatitis. Third, non-specific irritation, including sweat, residues of detergents, talcum powder, insecticides and so on. Prevention: correct choice and maintenance of the mat: try to use bamboo, rattan preparation of the mat, and do not use the grass mat, because insects are easy to breed, the grass mat itself is often an allergen. People with a history of skin allergies should be careful not to use talcum powder, insecticide, etc. on the mat, so as not to leave it on the mat and not to clean it up easily, and make sure not to leave residual detergent after scrubbing the mat. Keep ventilation indoors, and do a good job of mite protection measures for the mat, as follows: when using the mat is regularly cleaned, should be scrubbed two or three times with water, and then scalded with boiling water, can inhibit mites, and should be kept dry. Newly purchased mats and the first time each year before the use of mats, repeatedly scrub the mats with hot boiling water, and then put them in the sun for several hours, which can kill mites, bacteria and their eggs that are not easily visible to the naked eye. In autumn, this method should also be used when storing mats, and then put some anti-moth and anti-mold supplies to inhibit the growth of mites. Treatment: Correct diagnosis of the cause of the disease is the basis and prerequisite for effective treatment. In other words, it is clear how to get the disease, and then say treatment. For allergies, we should further clarify the diagnosis of allergens and follow the best treatment plan recommended by the World Health Organization – the “four-in-one” comprehensive treatment, i.e. avoidance of allergens, specific immunotherapy (i.e. desensitization), appropriate symptomatic treatment and good Patient education. If the cause is insect bites and non-specific stimuli, the cause should be actively removed and symptomatic treatment should be given.