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Glucocorticoid intramuscular injections are a quick, routine procedure done in an outpatient setting to relieve musculoskeletal pain quickly. However, despite being a low-risk procedure it can lead to local infections, including abscess and skin necrosis, and even more rarely, bacteraemia and multi-organ failure. In this case, we present a healthy, immunocompetent woman in her 40s diagnosed with a retroperitoneal abscess due to methicillin-resistant Staphylococcus aureus after an intramuscular injection of triamcinolone.