The child’s back is always itchy may be eczema, ringworm, contact dermatitis and other diseases. 1. Eczema: usually manifested as erythema, papules and itchy symptoms can appear everywhere in the body. The causes of eczema are many and complex, and may be caused by genetic, systemic diseases and environmental factors. 2. Ringworm: Ringworm infection may cause ringworm. The main manifestations are papules, papules and blisters, often accompanied by itching, mostly on the trunk and other places. 3. contact dermatitis: its cause is more, more and skin contact exogenous material related, lesions can be distributed in all parts of the body surface, lesions to erythema, edema, as well as pimples, itching and other symptoms. The cause of the child’s back is always itchy for more reasons, it is recommended that the patient to seek medical examination to clarify the cause of the disease.