“…Patients also mentioned other food products known for their histamine‐rich or ‐releasing properties (e.g., tomatoes, peanuts, alcohol, spices, eggplants, and vinegar), although less frequently. Noteworthy, pathology studies consistently found a several‐times higher number of mast cells, the main source of histamine , in OU biopsies of patients with BD or RAS than in the mucosa of controls . Moreover, when challenged by foods, patients with RAS showed increased histamine release , and the mast‐cell stabilizer cromoglycate sodium has had some benefit for OU attacks in RAS .…”