Faulty Injection Technique: A Preventable But Often Overlooked Factor in Insulin Allergy

Insulin hypersensitivity—a rare occurrence with currently available insulin preparations—may have varied manifestations, ranging from a local injection site allergy to severe generalized anaphylactic reactions. While various additives included in commercial insulin preparations and insulin peptides themselves remain the primary allergens responsible, faulty injection technique may at times potentiate the development of insulin allergy. Management of insulin allergy is complex, potentially dangerous at times, and can be challenging for the treating physician. We report a case of insulin allergy due to intradermal insulin injections which was cured by adopting a proper injection technique.