Atopic eczema, also called atopic eczema, is a form of eczema that occurs mainly in childhood. Eczema usually starts before the age of two and is mainly characterized by severe itching. Constitutional eczema is often associated with a predisposition to develop allergies. This predisposition is hereditary and is called atopy. If eczema develops in infancy, there is a good chance it will go away on its own later in life. However, eczema can persist chronically or come back later.