Eczema is an itchy, red rash that can appear all over the body and, in particular, occurs among people who have very dry, sensitive skin. The skin can blister and crack in some cases. There are 31.6 million people in the U.S. with eczema.95 It is usually diagnosed at a very young age. Babies with eczema typically have it on the face, especially the cheeks and chin, but they can also have it on the scalp, chest, back and outer arms and legs. Children and adults typically have the telltale rash on their necks, wrists, ankles and in areas that bend. The specific cause of eczema remains unknown, but it is believed to develop due to a combination of hereditary and environmental factors. Symptoms can worsen with exposure to common food allergens or other substances such as perfumes or soaps.