A 4-year-old boy was brought to see his family physician (FP) by his mom because of his exceedingly dry skin. His mom reported that moisturizers helped a little bit, but that his skin remained dry and scaly. No one else in the family had this condition. His FP noted that there was dry skin on all 4 extremities. The flexural areas were spared and there were no excoriations. What's your diagnosis?
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