Metastatic calcinosis cutis results from abnormal calcium levels leading to the precipitation of insoluble calcium salts in the skin and subcutaneous tissue. Here, we present the case of a 67-year-old man with multiple sclerosis on chronic dexamethasone and concurrent supplementation of calcium and daily cholecalciferol presenting with painful calcified lesions. During initial presentation, corrected calcium was 13.8 mg/dL (reference range: 8.5–10.1 mg/dL), ionised calcium was 1.70 mg/dL (reference range: 1.13–1.32 mg/dL) and 25-hydroxyvitamin D was 41.6 ng/mL (reference range 30–100 ng/mL). Normocalcaemia was restored with the off-label use of denosumab, usually reserved for hypercalcaemia of malignancy and intractable osteoporosis. We discuss potential aetiologies of this patient's hypercalcaemia, calcinosis cutis diagnosis and management and the off-label use of denosumab.
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