INS and type 1 diabetes mellitus: Rapid induction of insulin tolerance is critical for affected individuals, especially in acute complications such as diabetic ketoacidosis (DKA).<h4>Case presentation</h4>We report a case of a 50-year-old male with newly diagnosed T1DM who developed type I hypersensitivity reactions to multiple insulin analogs, manifesting as localized erythema, pruritus, and induration.