There are many types of rashes that babies are prone to, including maculopapular rash, pemphigus, and blister rash. Pediatricians often easily identify different causes based on the time of appearance, morphological distribution characteristics, and accompanying clinical manifestations of the rash. The most common rash disease in babies is chicken pox. 1, clinical features Chickenpox is an acute viral infection transmitted through contact or droplet. It is common in winter and spring, mainly in children aged 2 to 6 years old. After infection, children will have a low fever (below 38℃) and sore throat, and the rash appears a day after the fever, first on the head, trunk and armpits, gradually extending to the face and limbs. It starts as a red rash, which turns into a papule after a few hours, and then becomes an oval herpes surrounded by a red halo the size of a rice grain to a green bean after a few hours. The rash is more frequent on the child’s body and less frequent on the face and extremities. The blisters gradually dry up after a few days, then crust over and finally fall off. Since the rash appears in batches, macules, small herpes and crusting can be seen on the skin at the same time. 2. Home care Pay attention to rest, drink more water and eat easily digestible food when you have a fever. Keep your skin clean, change your clothes regularly, and don’t scratch the blisters to prevent infection. You can take oral Chinese medicine such as Banlangen to fight the virus. If there is secondary infection, apply antibiotics under the guidance of the doctor. The baby should be isolated until the rash is all crusted and dry. 3. Prognosis Usually no scars are left and lifelong immunity can be obtained after healing. The chickenpox vaccine has been developed successfully and one dose is given at the age of 1 to 12.