If you’ve ever injured your fingernail or toenail, you may have noticed blood pooling under the nail bed’s surface. This bruising is called a subungual hematoma. It’s usually caused by a crushing or ...

Although uncommon, blood clots can form in the finger. They may appear as a small, discolored lump under the skin. A collection of blood can also form under the fingernail, commonly due to injury such ...