What to watch with IgG and Haut?

Regarding IgG and skin, the question often refers to IgG food sensitivity tests for conditions like eczema or urticaria. The scientific evidence is weak: elevated IgG to foods typically reflects immune exposure, not intolerance or allergy. True allergies are IgE-mediated. Some research links IgG4 to chronic inflammatory skin diseases, but clinical utility remains unclear. Commercial IgG tests are not recommended by medical societies because they often lead to unnecessary dietary restrictions. For skin issues, first rule out IgE allergies, contact dermatitis, or other factors (e.g., microbiome, stress). Genetic testing for IgG-related genes (e.g., HLA) currently has no proven benefit for skin health. Be cautious of marketing claims; evidence is mostly mechanistic or from small studies. For persistent skin problems, consult a dermatologist.