Red rashes on the back of infants may be due to eczema, heat rash, etc. They are treated with general care and topical medications. 1. Eczema: infant eczema may be the living environment stimulated by chemicals, sweat soaked back to form eczema, manifested by a red rash on the back, pay attention to avoid contact with allergens, to keep the skin dry and clean, the acute stage with boric acid solution wet compresses to relieve, no oozing topical glycerine lotion, the chronic stage of the treatment of dehumidification and anti-itching ointment coated. 2. Heat rash: heat rash occurs in the hot season, due to sweat pore obstruction caused by the back sweat more, manifested as a red rash on the back, after the cool will slowly subside. Sweating should be dried in time and change clean food, can also use topical glycerin lotion to relieve. There are many reasons why babies get red rashes on their backs, so it is recommended that you seek medical attention to identify the cause of the rash, and follow your doctor’s instructions when using medication.