What is eczema?  I normally tell my patients that eczema is dry skin with an attitude.  It is often used as a catch-all word for atopic dermatitis, dyshidrotic eczema, nummular dermatitis, diaper dermatitis, allergic and irritant contact dermatitis. Atopic dermatitis is usually diagnosed in infancy.  The incidence has been increasing in developed countries.  A…