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Dermal reaction to certain cereals is more likely a common allergy rather than coeliac disease although the latter may be so severe and persisting for so long (because of non-cereal-abstinent nutrition) that antibodies are built against cereal proteins. Though this scenario is hypothetical, involves to a lot of bad luck, and likely requires some type of skin issue as well.Or it's an imaginary reaction or, especially in kids, a pseudo-allergy.
A reference to a dermatology book in Portuguese that's not available online doesn't convince me topical gluten sensitivity is impossible, I'm not claiming it's common but I don't think that enough to rule it out.Jacques CMC. Ramos-e-Silva M, Castro MCR. Fundamentos de Dermatologia. Rio de Janeiro: Atheneu; 2009. Dermatite herpetiforme e dermatose por IgA Linear; pp. 653–658. [Google Scholar]There's some anecdotal evidence hinting to the possibility: "...it is my clinical experience that several patients with celiac disease and dermatitis herpetiformis have reported reactions to what appears to be topical exposure to gluten (or air-borne in the case of hair spray) in body care products and that this reaction resolved once they stopped using the gluten-containing product. We do not know for certain if it was a gluten-containing ingredient or some other ingredient that caused the reaction, or if the product was tested for gluten. However, each of us knows our own body best. I support my patients who follow a gluten-free diet in selecting cosmetics free of gluten, in particular lip products and hair and face lotion, should they choose to do so."https://nationalceliac.org/celiac-disease-questions/using-gluten-free-skin-body-products-someone-celiac-disease/