ABSTRACT
These density variations correspond to lower numbers of hairs per follicular unit (FU). Khan found that Caucasian men have an average of 10% 1-hair FUs, 40% 2-hair FUs, and 50% 3-hair FUs. In contrast, Koreans have 37% 1-hair FUs, 38% 2-hair FUs, and 25% 3-hair FUs ( 4 ). Japanese men have 30% 1-hair FUs, 50% to 55% 2-hair FUs, and 15% to 20% 3-hair FUs. Thai men have 24% 1-hair FUs, 64% 2-hair FUs, and 13% 3-hair FUs ( 2 , 6 ).
