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The Second to Fourth Digit Ratio in Acne Vulgaris.

DOI: pde.12594  PMID: 25940068  

Androgen hormones are thought to play a leading role in acne vulgaris (AV). The 2D:4D digit ratio refers to the ratio of the length of the second finger (index finger) to that of the fourth finger (ring finger). It is thought that the balance between fetal testosterone and fetal estrogen during the prenatal period largely determines this ratio, which does not change with age in the postnatal period.

Unal M,  Urun Unal G,  Balevi S,  Tol H,  Uyar M

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