Calcinosis cutis is a condition in which calcium salts are deposited in the skin and subcutaneous tissue. It is classified into five main types: dystrophic, metastatic, idiopathic, iatrogenic, and calciphylaxis. Calcinosis may be caused by trauma, inflammation, varicose veins, tumors, infections, connective tissue disease, hyperphosphatemia, and hypercalcemia. Calcinosis cutis is associated with systemic sclerosis.