My 2 year old daughter had a rash on her face and bottom for 3 months. It went away for 2 weeks and now it is back. Only now it is on her face, bottom, chest, belly, legs, and arms. The doctor didn t know what it was. A friend told me it might be a milk allergy, but I don t know. She has been very cranky (not sleeping well).Please give me some ideas of what it might be. Thanks