What are the differences between dermatitis and eczema?

Interchangable: The difference between dermatitis and eczema is more or less academic. Dermatitis emphasizes "inflammation" which only reveals in pathological tissue exam. Eczema is a clinical term without referring to pathological finding. Classically, eczema involves seven features: erythema/redness, oozing/blistering, scaliness/flaking, crusting/cracking/dryness, swelling, itching and bleeding.

All ecxema is a : Dermatitis, not all dermatitis is eczema. This is a wording issue. Eczema is just type of problem that involves the skin. A dermatitis is a broad word that includes anything that causes disruption of the healthy skin.