IGHE and peanut allergic reaction: Following immunotherapy for peanut allergy, allergen‐specific IgG4 levels have been found to increase11, 12, 13, 14 and specific IgE levels to peanut and peanut skin prick test to be reduced,11, 12, 14 which is aligned with serology changes observed with the rest of the allergen‐specific immunotherapies.15, 16, 17, 18, 19