What is it without a beard in the middle? Why don't I have a beard?
Beard, commonly known as beard, refers to the hair that grows on men's upper lip, chin, cheeks, cheeks or neck. Men after puberty generally have beards. Beard grows faster than hair, which is the result of androgen.
If we want to distinguish carefully, "Hu" originally refers to the hair that grows on the mouth, while the upper lip is called "moustache" (moustache, moustache and "two-lipped beard" in Cantonese) and the chin is called "goatee".
Those whose temples are connected with the chin are called beards (also called whiskers and bearded beards), those on the cheeks are called beards, and those with curls are called campuses.
The more vigorous the reproductive function, the faster the beard grows. Beard has more blood vessels than hair roots, and nutrients are easy to obtain. Therefore, as long as you shave your beard, it will grow back in a few days.
A long beard is a sign of a man's secondary sexual characteristics. The emergence of secondary sexual characteristics is stimulated by androgen secreted in the testis after men enter puberty. There are few male hormones in boys before puberty, and there is little difference between male and female signs. There is no strict time limit for boys' puberty development.
Beards grow quickly. A healthy man's beard grows 0.4 mm a day, which is faster than his hair (0.2 ~ 0.3 mm a day). This is because the blood vessels in the beard are more distributed than the hair roots, and nutrients are easy to get. The average adult has about 25,000 beards, which vary greatly according to different individuals.
Men begin to grow beards in their teens, and they grow most luxuriantly around the age of 30, and will gradually decrease after the age of 30, so the beards may not be shaved more and more.
The level of androgen in healthy men is basically the same, but the number of beards varies from person to person. Some people have thick beards, while others have sparse beards; Some people have beards, others have goatees. These are the differences under normal circumstances. The number and shape of beards are also related to family inheritance, which is normal. Don't worry at all.
Whether a man without a beard is morbid depends on the whole body development. If a man has no beard, but his reproductive organs and the above-mentioned secondary sexual characteristics develop normally, it is not morbid. It is normal for boys to grow beards at different ages, some years earlier and some years later, so don't worry at all.
If you have entered puberty and have no beard, the secondary sexual characteristics are not obvious. Even after puberty, you are still undeveloped. This should be considered abnormal. It may be that there is something wrong with gonadotropin, which regulates the secretion of sex hormones, and it is necessary to go to the hospital for examination and treatment.
colour
Most people's beards are black, but of course some people's beards are brown or reddish brown. It is believed that the color of beard is determined by pigment cells, and pigment is obviously related to the metal elements contained. For example, black contains copper, cobalt and iron, brown is made of titanium, red is made of molybdenum, and white is completely free of these metal elements.
The above content source: Baidu Encyclopedia-Beard