Angioedema - Immunology; Allergic Disorders - Merck Manual …
https://www.merckmanuals.com/professional/immunology-allergic-disorders/allergic,-autoimmune,-and-other-hypersensitivity-disorders/angioedema
WEBAngioedema is edema of the deep dermis and subcutaneous tissues. It is usually an acute but sometimes a chronic mast cell–mediated reaction caused by exposure to a drug (eg, angiotensin-converting enzyme inhibitors), venom, dietary, pollen, or animal dander allergens, or it can be idiopathic.
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