What is eczema?

Eczema is a general term for rash-like skin conditions. The most common type of eczema is called atopic dermatitis, which is an allergic reaction. Eczema is often very itchy and when you scratch it, the skin becomes red and inflamed. Eczema affects adults and children, but it is most common in babies.

Atopic dermatitis is a chronic skin condition. "Atopic" describes an inherited tendency to develop dermatitis, asthma and hay fever. "Dermatitis" means that the skin is red and itchy.

Atopic dermatitis usually starts during infancy and continues into childhood. There are times when the condition gets worse (called flare-ups). Flare-ups are followed by times when the skin will heal and there may be no signs of atopic dermatitis (called remission). Remission can last for weeks, months or even years. Some children will outgrow atopic dermatitis, and others will still have it when they are adults. Flare-ups in adults tend to be less severe.

See the article here:
Eczema and Atopic Dermatitis | Overview - FamilyDoctor.org