Atopic dermatitis  is a long term (chronic is referred ) skin disorder  that  involves scaly and itching rashes. causes  Atopic dermatitis is due to a skin reaction (similar to an allergen) in the skin the reaction leads to ongoing swelling and redness. people with atopic dermatitis may be more sensitive because their skin lacks certain proteins.  Atopic dermatitis is most common in infants. it may starts as early as age 2  to 6 months. many people  outgrow it by early childhood. people with atopic dermatitis often have asthma or seasonal allergies. There is often a family history of allergies such as asthma ,hay fevr , or eczema. people with atopic dermatitis often  test positive to allergy skin tests. however, atopic dermatitis is not caused by allergies. The  following can make atopic dermatitis symptoms worse: allergies to pollen, mold , dust mites, or animals. cold and dry air in the winter  colds or the flu contact  with irritants and chemicals  contact with with rough with roug