A previously healthy 12-month-old girl presents to the office for a well-child visit. Her mother mentions a recurring red blotchy facial rash that appears during or right after mealtimes. This was initially noticed around 6 months of age, shortly after introducing solid foods. At first, the blotchy rash seemed to come on several times when trying applesauce, and her mother wondered whether this might be an allergic reaction. As a result, the mother had avoided applesauce for a while. Since then, the mother has noticed the rash at mealtimes with other foods also, and it has been happening on a more frequent, daily basis. The rash is nonraised, red and blotchy—on further probing, the mother reported that it consistently appears on the left side of her face, around the region of the temple and cheek. There is no itching, swelling of face/lips/tongue, wheezing/stridor, vomiting, or rash elsewhere on the body....

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