Finger nail changes in a Negro woman with thyrotoxicosis were shown at the April 1948 meeting of the Chicago Dermatological Society. A statement by a surgeon interested in surgery of the thyroid that these changes were more often seen in the Negro aroused interest in possible differences between finger nails of the Negro and those of the white person.
Twenty-five definitely white persons and 25 persons with definitely negroid characteristics were examined. These were both male and female, and of all age groups. It was found that the finger nails of the Negro seem to have a tendency to be longer and proportionately narrower than the nails of the white person. The outstanding difference was the presence or absence of the lunula. Eleven Negroes showed no lunula in any of the finger nails. Only 2 white persons showed
no lunula; these were of Lithuanian and Swedish-Irish descent. Eleven Negroes showed
HARRIS RH. COMPARISON OF FINGER NAILS IN NEGROES AND WHITE PERSONS. Arch Derm Syphilol. 1950;61(1):115–116. doi:10.1001/archderm.1950.01530080121016
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