Every summer, especially the three volt days, always see many months to more than a year old baby extensor, shoulder patch distribution of dense red papules, some even fused into patches, baby skin moist, itchy, often scratch. This situation generally occurs two to three days after the baby used the mat, and gradually aggravated, the reason is that the mat’s own materials, residual chemicals in the process, mites breeding in the humid environment, stimulating bites caused by allergies, infants and young children with a strong metabolism, sweaty impregnation, coupled with delicate and sensitive skin is more likely to occur. The best way to prevent cooler dermatitis is not to use the cooler, so that the baby sleeps on a dry cotton sheet, even with the cooler, must be repeatedly ironed and dried before use, and often ironed and dried during the use of the cooler, it is best to lay a cotton sheet on top of the cooler, in addition to give the baby a bath often, in time to wash away any invisible substances on the skin that may cause allergies. The treatment of cooler dermatitis is to first remove the cooler, and according to the specific situation to be used topically (or add oral) anti-allergy anti-itch drugs.