Each of these smaller groups of undercoat hairs penetrate the skin through a common follicle opening, whereas the outercoat hair has a separate opening.

Figure 1: Diagram of the anagen hair follicle, which is in the active growth ... by in vitro correction of a mutation in cultured mutant skin keratinocytes from patients with lamellar ichthyosis ...

The DHT in turn causes follicles to sprout shorter and finer hairs before eventually dying out. It also causes the growth phases of hair follicles to become shorter, and the rest phases to be longer.