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 and length, and they became "more complex". This accounts for the greater synaptic densities in humans when compared to other primates and rodents. Somel et al. said that 48% of the genes that affect the development of the prefrontal cortex change with age differently between humans and chimpanzees. Somel et al. said that there is a "significant excess of genes" related to the development of the prefrontal cortex that show "neotenic expression in humans" relative to chimpanzees and rhesus macaques. Somel et al. said that this difference was in accordance with the neoteny hypothesis of human evolution. Dr. Bruce Charlton,