[header] How to handle an eczema flare up [title] Identify triggers for atopic dermatitis. [step] Atopic dermatitis is essentially a chronic allergic reaction. It is most common in children and babies. 
However, an adult can have this type of eczema as well. Flare-ups of this type of eczema can be caused by irritants, allergens, stress, fabrics, and dry skin, to name just a few.