Approximately 20% of patients with limited scleroderma develop calcinosis - deposits of calcium under the skin mainly occurring in the fingers and over bony prominences such as elbows. The lumps may break through the skin and drain white material. They may also be a cause of infection and ulceration. It is not really known why they occur and there is certainly a need for more research in this area. Calcinosis is not related to the amount of calcium in your food or taking calcium supplements.
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