The early-aged hair loss occurred in the age of 20-30 years. The baldness began from both sides of the forehead and gradually extended to the forehead and the top. The hair in the hair loss area is not only rare, but also the remaining hair is thin and hairlike. Because the disease occurs in youth, it is called premature alopecia or alopecia. It is also called seborrheic alopecia because it is often accompanied by seborrheia, pruritus and dandruff, but seborrheic is not the characteristic of early baldness. Alopecia areata is a type of human hair style, which has obvious genetic characteristics. Although the patients are bald in the early years, their hair turns white significantly later than other hair styles in the middle and old age. It has been found that androgen plays an important role in early alopecia. Because of the protection of estrogen, women’s general symptoms are not as serious as men’s.
The age, range and speed of alopecia areata are different from person to person. Different from alopecia areata, sideburns, eyebrows and armpits are not affected except for hair.