Hirsutism or central. It can be caused by increased levels of androgen hormones. The amount and location of the hair is measured by a Ferriman-Gallwey score. It is different than hypertrichosis, which is excessive hair growth anywhere on the body. Treatments may include birth control pills that contain estrogen and progestin, antiandrogens, or insulin sensitizers. Hirsutism affects between 5–15% of all women across all ethnic backgrounds. Depending on the definition and the underlying data, estimates indicate that approximately 40% of women have some degree of unwanted facial hair. Hirsutism affects members of either sex, since rising androgen levels can cause excessive
Neoteny in humans Australia, said that he agrees that neoteny in humans may have become "accelerated" through "two-way sexual selection" whereby females have been choosing smart males as mates and males have been choosing smart females as mates. Neoteny has been important to human evolution, because it has increased the maturation period and the size of the human brain. Two to three million years ago, there was an "incomplete segmental duplication of [the] ancestral SRGAP2" gene in the ancestors of humans. This new gene, SRGAC2, slowed spine maturation and allowed for more neuronal migration. As a result, the dendrite spines increased in number