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As a matter of genetic interest, it may be worth while to record the occurrence of acne in one identical twin and not in the other. The patient, a young woman, aged 23, had a mild acne of several months' duration. It is perhaps significant that she had not had it during adolescence when the hereditary qualities of the skin seem to be most important in its production.
She was accompanied by her twin sister, who was physically identical, even to the point of having the same impacted wisdom tooth on the same side. The teeth of the twins, however, are not identical in all respects. The teeth of the second sister are straighter, and she has always required less dentistry than her sister with acne. In other respects the two are physically the same; their hands and feet, stature, eyes, hair and complexion are the same, and they are
WILLIAM ALLEN PUSEY, HERBERT RATTNER. ACNE IN ONE OF IDENTICAL TWINS. Arch Derm Syphilol. 1934;29(5):706. doi:10.1001/archderm.1934.01460110064010