Red rash on children’s back, consider red prickly heat, toddler eczema, toddler emergency rash, etc. 1. Red prickly heat: red prickly heat is a type of prickly heat, usually occurs in hot summer or hot and humid environment, mainly in armpits, elbow, forehead, neck, back, etc., mainly manifested as 2~4 millimeter size of densely distributed papules, papules, accompanied by burning and itching symptoms. 2. toddler eczema: it is an allergic skin disease caused by genetic and environmental factors, divided into oozing type and dry type, oozing type is mainly manifested as ill-defined erythema, and accompanied by dense pinpoint-sized papules, pimples and blisters, and the dry type will appear as light red or dark red patches, generally dry skin, scaly, no oozing. 3.toddler rash: toddler rash is caused by human herpes virus type 6 and 7, before the rash is usually accompanied by high fever, high fever lasts for 3~5 days after the sudden fever, and then a rash appears, the rash is a pink tiny dense macular rash. Children with red rashes on the back may also be other reasons, it is recommended to go to the hospital for a detailed examination, by the doctor to clarify the cause of the disease, standardized treatment.