Abstract
A diabetic patient had delayed local cutaneous allergic reactions to insulin. His lesion, biopsy findings and treatment were described. Allergic reactions to insulin may be immediate local or systemic, which are Ig[immunoglobulin]E-mediated, or delayed local, which are IgG-mediated. Recommended management of local reactions was to use a single-peak pork insulin of the insulin zinc suspension series. Progressive immediate local reactions may herald the onset of systemic reactions. Hospitalization and desensitization to insulin may be required for systemic allergic reactions to insulin.

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