Eczema is a common childhood skin condition that is characterized by being extremely itchy. The skin is typically dry, with redness or loss of colour. In adults eczema affects flexor surfaces such as the elbow and behind the knees. In infants and children the face, scalp, and limbs are affected and the rash can be oozing and crusting in appearance. The most common type of eczema is atopic dermatitis, and these two terms are often used interchangeably.