Small nail matrix hemorrhages are incorporated into the nail plate by the distal production of hard keratin. The more proximal the hemorrhage in the nail matrix, the higher the pocket of dry blood will be in the nail. Technically this condition is best described as an intraungual hematoma.
STONE OJ, MULLINS JF. The Distal Course of Nail Matrix Hemorrhage. Arch Dermatol. 1963;88(2):186–187. doi:10.1001/archderm.1963.01590200074014
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