Hand Eczema, Itchy face, Acne, Dermatologist. Root cause of disease The most common cause of hand eczema is contact irritants. In Meding’s study, the most common type of hand eczema were irritant dermatitis (35%), atopic hand eczema (22%), and allergic contact dermatitis. Symptoms In hand eczema: Causes Hand eczema is triggered by exposure to chemicals….