Toenails are usually semi-transparent but can turn purple, black ... skin. Injuries can cause toenail discoloration due to a subungual hematoma, which involves blood and fluid collecting under ...

A black band isn’t the only skin cancer symptom that could be hiding under your nail polish. Other signs of nail melanoma include darkened skin around the nail and cuticle, blood, pus and splits ...

The surrounding skin might be red ... When trauma occurs, blood may pool under the nail, creating a dark purple or black ...