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1833 W. B. Dickinson tr. P. Rayer Treat. Dis. Skin 357 In icterus, the nails have sometimes a yellow appearance; they are black in subungual ecchymosis [Fr. noirs dans les ecchymoses sous-unguéales].

1947 Brit. Med. Jrnl. 6 Dec. 902/2 The nails of fingers and toes were brittle and showed much subungual proliferation.

2000 M. A. Goldstein & M. C. Goldstein Boys into Men vii. 89 But blood may still form under the toenail, a condition known as subungual hematoma, particularly when playing a sport like soccer or tennis.