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Typically referring to a measurement on an imaging study (xray, CT scan, MRI, ultrasound), sub-centimeter refers to a measurement less than 1 centimeter.
In this article. A subungual hematoma is a condition in which there is bleeding under the fingernail or toenail. Usually caused by a crush injury, a subungual hematoma can cause symptoms such as intense pain and throbbing as blood collects under the nail.he most common symptom of a subungual hematoma is severe, throbbing pain generated by the pressure of blood collecting between the nail and the nail bed. Other symptoms include: 1  A dark-colored discoloration (red, maroon, or purple-black) under all or part of the affected nail.