May 2011 in “Archives of Plastic Surgery” Korean men in their 20s and 30s most commonly have an inverted U-shaped hairline.
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March 2011 in “Dermatologic Surgery” The new hairline classification and correction methods can improve the appearance of Asian women with wide or M-shaped foreheads.
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January 2014 in “Annals of Dermatology” Korean people prefer M-shaped hairlines and lower foreheads, with no major differences across various demographics.
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December 2022 in “Archives of Dermatological Research” The study created a new system to classify Asian men's hairlines to help with hair loss treatment and cosmetic procedures.
Hairless mammals evolved quickly in both gene and non-gene areas related to skin and hair.