Greater Tendency to Acne in White American than in Japanese Populations1

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Abstract
In studies of white subjects living in the United States and of Japanese living in Tokyo and Yokohama, extensive acne was observed to be more common among the American than the Japanese populations. These observations, and the previously reported higher incidence of male pattern baldness in Caucasoids than in Mongoloids, are in accord with the hypothesis that tendencies to pronounced development of secondary sex characters may merge with tendencies to certain sex-selective pathologic conditions. Sex differences in acnegenesis were marked; especially in the Japanese; acne was more extensive and retained at a later age in males than in females. Ethnic and sex differences in the production of sebum and acne were similar in direction to ethnic and sex differences in growth of beard and axillary hair. This suggests that sebaceous and piliary structures can be a unit, not only morphologically in the form of pilosebaceous aparatuses, but also physiologically in that the component parts react similarly

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