Why some people just can't get a tan?

Is the person's sunscreen mechanism innate? Why don't some people get sunburned? Ladies and gentlemen, Bian Xiao can clearly tell you that some people don't get a tan, while others get a tan easily, which is determined by the amount of melanin contained in the human body. Melanin is a kind of biological pigment, which is formed by a series of chemical reactions of tyrosine or 3,4-dihydroxyamphetamine. Animals, plants and protozoa all have this same pigment. Melanin usually exists in the form of polymerization, and it is because of melanin that our skin has color. Once melanin cannot be formed for some reason, it will also cause pigment loss, thus forming white spots.

Melanin is actually an amino acid derivative that exists in everyone's body. 20-25 years old is the active period of melanin precipitation. They exist in the middle of skin cells, also called "pigment mother cells". Melanin is secreted by pigment mother cells. When ultraviolet rays (B wave and A wave) irradiate the skin (B wave means that UVB acts on the basal layer of the skin), the skin will be in a state of "self-protection", that is, melanin is stimulated by ultraviolet rays to protect our skin cells.

Dopa is actually the precursor of melanin, which is oxidized by tyrosine and releases melanin. Melanin moves through the metabolic layer of cells and forms dark spots and other shapes in the epidermis of skin. It can be seen that people's sunscreen mechanism is not innate, but is determined by melanin. This is determined by your genes! Then the question is, why don't some people get a tan?

Ladies and gentlemen, some people are not easy to get a tan because they lack a certain amount of melanin in their bodies. Therefore, after the skin is exposed to the sun, the pigment is not easy to deposit, so it is not easy to turn black. However, such people also have bad times. Because they lack a certain amount of melanin, they are prone to skin diseases and sensitive skin, and the easiest thing to get is skin cancer. Moreover, some people are prone to tanning, that is, there are many melanin in the body and the pigmentation is fast. The biggest advantage of this kind of people is that their skin is basically healthy, and their resistance is strong. Generally, there will be no skin diseases and the like.