Medical practitioners do not totally understand the root cause of eczema. Genetics, infections, and allergies seem to contribute to the problem. Overall, ingestant allergies seem to be the largest contributor, although only about a third of “moderate-to-severe” eczema cases have been associated with a food allergy trigger.
Our companion site, Sinus & Allergy Center of the Midwest, provides more information on ingestant allergies.
Here in South Dakota, the cold wind can contribute to cheek eczema. Staphalococcal infections can also play a minor role.