DD's had full-body eczema in the past from food chemicals. Now we're doing a dairy trial, and she seems to be getting eczema only on her butt...which is one place where she never got eczema from food chemicals. But she did have eczema on her butt when she was very small, before we figured out that she reacted to dairy. She does still get eczema on her back and sides when the food chemical levels gets too high, so it doesn't seem to be a matter of eczema just happening to come back in a different spot. Is it possible for different foods/different things to actually cause eczema only in specific spots or in different spots?