What is the X in X-mas?
1876; see dermato- + -itis.
dermatitis der·ma·ti·tis (dûr'mə-tī'tĭs)n. pl. der·ma·ti·tis·es or der·ma·tit·i·des (-tĭt'ĭ-dēz') Inflammation of the skin.
An inflammation of the skin. Itching and redness are the basic symptoms of dermatitis, which has a variety of causes, including allergies and exposure of the skin to irritants, such as chemicals or sunlight.