Get the book. ) All the below is from Wikipedia articles. http://en.wikipedia.org/wiki/Atopy and http://en.wikipedia....opic_dermatitis Atopy ( / ˈ æ t ə p i / ; Greek ἀτοπία - placelessness, out of place, special, unusual) or atopic syndrome is a predisposition toward developing certain allergic hypersensitivity [1] reactions. Atopic dermatitis ( AD