The term eczema refers to a number of different skin conditions in which the skin is red and irritated and sometimes has small, fluid-filled bumps that become moist and ooze. The most common cause of eczema is atopic dermatitis (sometimes called infantile eczema), which affects older kids as well as infants.
Kids who get eczema often have family members with hay fever, asthma, or other allergies. Some experts think these kids may be genetically inclined to get eczema, which means characteristics have been passed on from parents through genes that make a child more likely to get it.
About half of the kids who get eczema will also someday develop hay fever or asthma themselves. Eczema is not an allergy itself, but allergies can trigger it. Some environmental factors (such as excessive heat or emotional stress) also can trigger the condition. source