Eczema is sometimes best characterized by the rash. As an abnormal fluctuation in the color of skin takes place, this symptom shows up. Doctors also define this phenomenon as the periodic skin eruption. Inflammation is usually accompanied by the skin rash. When trying to decide whether the patient has eczema or another form of the disease, the health care provider should mind the damaged parts of the body as well as the color/shape of the rash.