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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.
These are cyanosis symptoms. Cyanosis is a health condition causing bluish discoloration of your skin or mucous membranes. The blue color is a sign that oxygen is lacking in your blood. Cyanosis is noticed by blue lips, nails, toes and fingers.Although oxygen deficient blood is not blue, it is not as bright red as blood drenched in oxygen.As such, this low oxygen level makes your lips, fingers, toes and nails appear blue.Most cases of cyanosis is a symptom for heart disease, lung disease or some type of terminal event, like cardiac arrest or heart attack.s such, this low oxygen level makes your lips, fingers, toes and nails appear blue. Most cases of cyanosis is a symptom for heart disease, lung disease or some type of terminal event, like cardiac arrest or heart attack.