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Nicolau syndrome is a rare serious drug reaction associated with the administering various injectable medications. It is often characterized by an acute and severe pain accompanying erythema that tends to rapidly evolve into the livedoid reticular or hemorrhagic patches and less commonly to ulcers and skin necrosis. Herein, we report a 34-year-old woman who presented with painful, tender discoloration over her abdominal skin following subcutaneous glatiramer acetate injection. Since the patient was diagnosed with multiple sclerosis 18 months ago, she had been on treatment with subcutaneous glatiramer acetate injections thrice weekly. The patient was diagnosed with Nicolau syndrome clinically and histopathologically. After 15-day treatment with topical betamethasone valerate and mucopolysaccharide polysulfate cream twice daily, the lesion completely regressed with only minimal hypopigmented irregular scarring. Nicolau syndrome should be considered in patients with severe pain, tenderness, and redness localized at the injection site following glatiramer subacetate., Competing Interests: None