Rosa Perez, a 12-month-old female, presents for a well visit with new onset of dry, itchy skin patches, particularly behind her knees and in the creases of her elbows. Her overall health is reported as good, with no significant past medical history or known allergies, and she is meeting all developmental milestones except standing independently. The rash, which has worsened over three weeks, is not severe, and no family history of similar conditions is noted; her mother has applied lotion with no improvement.