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Black-and-Blue Toenails (Hematoma). Unlike with yellow toenails, black-and-blue toenails are not actually caused by a change in the color of the nail enamel itself. Black-and-blue toenails are caused by an injury to the skin beneath the toenail. As blood and fluid collect beneath the nail plate the nail itself, which is somewhat translucent, begins to appear black.
Another cause of black toenails is fungus, or onychomycosis. This common fungus begins with white spots and can advance to thick, yellow toenails. Again, ill-fitting shoes rub tiny breaks into the nail, leaving it open for infection from foot perspiration.