Children’s back itchy dense small bumps consider prickly heat, eczema, molluscum contagiosum and so on. 1. prickly heat: prickly heat is common in summer and hot and humid environments, and is more common in children, summer or hot and humid environments will sweat more, this time the small sweat ducts in the conduit will be clogged to cause the skin symptoms, mainly manifested in the skin raised small blisters, pimples, papules and pimples and so on. 2. Eczema: the cause of eczema in young children is not particularly clear, considering the genetic, environmental and other factors caused by immune dysregulation, starting at 2-3 months of infants, manifested as erythema, papules, oozing and so on. 3. Molluscum contagiosum: caused by molluscum contagiosum virus infection, manifested in the center of the umbilical concavity of the papule. Children’s back itchy dense pimples, more causes, it is recommended to go to the hospital, by the doctor to clarify the cause of the disease, standardized treatment, to reduce the adverse effects of the disease.