Pigmentary demarcation lines (PDLs) are borders of abrupt transition between 2 zones of skin, one more deeply pigmented and the other with a lighter pigmentation. Pigmentary demarcation lines follow the Voigt lines, which delimit the distribution of peripheral nerves and are usually observed among black and Japanese subjects, but only rarely in white subjects. On the basis of their location, 5 groups of PDLs have been identified and labeled A through E.1 Types A, B, and C PDLs are the most common and are detectable in white people.1
Recently, lines on the face have been described and labeled as type F PDLs.2
Bonci A, Patrizi A. Pigmentary Demarcation Lines in Pregnancy. Arch Dermatol. 2002;138(1):127–128. doi:10.1001/archderm.138.1.125
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