My 15 month old DD tends to scratch her buttocks and thighs when I get her undressed for her bath. When she scratches the area goes all red, but it doesn't seem to be dry at all. She doesn't seem to try to do it much through her clothes in the day - it's the area covered by her nappy really (she wears disposables). Any idea what this could be? Just a wierd habit or a genuine irritation of the skin? I've thought of washing powder but we generally use those ecoball things. Could it be an allergy of some sort, or would she then itch it more?