Why is human skin dark?

Skin is a very important part of people because it is an important part of the image and can provide a solid foundation for people's healthy image. Moreover, the color of the skin will change with the health level. For example, most healthy people have very fair and shiny skin, while some people's skin looks very dark. Let's take a look at why people's skin becomes dark?

1. The foods you like are rich in zinc, copper and iron. Certain foods are also the cause of darkening of the skin. Foods rich in metal elements such as copper, iron, and zinc have this disadvantage. These metal elements can directly or indirectly increase the amount and activity of substances such as tyrosine and tyrosinase that are related to melanin production. These foods mainly include animal liver, kidney, oysters, shrimp, crab, beans, walnuts, black sesame, raisins, etc.

2. The drug has affinity to melanin. Many drugs also change the normal skin color. For example, chloroquine has a strong affinity for melanin, which aggravates skin discoloration; about 10% of patients taking quinine develop blue pigment spots on their faces. Sedatives pose the greatest threat to skin color. Those who take them for a long time will develop butterfly spots on their face and neck, and their arms and other parts will turn brown-gray, light blue or light purple. In addition, repeated use of mercury-containing ointments can also leave brown pigmentation on the affected area. There are more anticancer drugs that cause skin color changes.

3. The natural environment damages the skin. The culprit is ultraviolet rays, which stimulate the melanin in the skin and induce skin lesions such as freckles. Even on cloudy days, the "ultraviolet rays" are still strong. Ultraviolet rays can cause skin darkening, aging, and wrinkles. Human skin's response to ultraviolet rays causes redness, tanning and increased thickness of the skin's epidermis in acute reactions, and leads to skin aging in chronic reactions. In the summer, if you still want to have fair and flawless skin, you should do a good job of sun protection, especially when the UV index reaches 7 or above, it is more likely to damage the skin. You should strengthen sun protection and don't be afraid of trouble and cause regret in the future. In fact, humid air, sunlight coming through car windows, and even indoor light bulbs and computers are all the culprits that cause your skin to become darker.