Problem: A 13-month-old girl is brought to the pediatrician by her parents for itchy rashes on her arms, legs, and cheeks. The rashes appeared gradually over the past few weeks and seem to be worsening. Her skin has always been dry, and her parents have used baby lotion on her since she was a few weeks old. She has not had fevers or any recent illnesses. On physical examination, she has scaly, crusted, pink, ill-defined patches on the flexural surfaces of her arms and legs. Both cheeks are also red, with notable excoriations. The remainder of her examination is normal.
What is the pathogensis of the disease/condition that you identified