The hair on the top of the head will start to thin out. Over time, the male is left with a horseshoe- shaped pattern of hair around his head. Some males will have only a receding hairlines or bald spots on the crowns of their heads. The hair that remains in the balding areas starts out as long, thick, and pigmented and changes into fine, unpigmented sprouts that grow at a slower rate. If a man begins losing his hair during his mid- teen years, there is a good chance he will go completely bald on top of his head.
Androgenic alopecia is another factor that can cause male-pattern baldness.
DHT influences male behavior, from the sex drive to aggression. Testosterone converts to DHT by 5-alpha reductase, an enzyme produced in the prostate, various adrenal glands, and the scalp. Female-pattern baldness usually causes the hair to thin out all over the head, but rarely progresses to total or near baldness as it does in men. This type of hair loss is permanent. Toxic Baldness Toxic baldness occurs in males as well as females.