a metatarsal is a bone in your foot!

yes

dystrophic calcification means deposition of ca salt inassociation with mild concentration of other minerals such as megnesium of any necrotic or degenerated area what ever the type of necrosisand occurs inspite of normal serum calcium and normal calcium metabolism and it usually starts in mitochondria while metastatic calcification charechtrized by wide spread calcium deposition in normal and abnormal tissue every where in the body due to high serum calcium level

parenchymal calcification

Dystrophic EB is caused by mutations in genes for type VII collagen, the protein contained in the fibers anchoring the epidermis to the deeper layers of the skin