The second is certain foods. Foods rich in copper, iron, zinc and other metal elements may lead to skin blackening.
This is because these metal elements can directly or indirectly increase the quantity and activity of tyrosinase, tyrosinase and dopamine quinone related to melanin production. These elements mainly exist in animal livers, kidneys, oysters, shrimps, crabs, beans, walnuts, black sesame seeds, raisins and other foods.
The third is some diseases. Some diseases can change normal skin color and make it black. Among them, the most common diseases are endocrine system diseases, chronic wasting diseases and malnutrition diseases.
These diseases can make the skin brown or dark brown, especially in exposed parts such as face, back of hand and joints, or in areas such as compression and friction. Another example is chronic liver disease, which can cause chloasma on the face or blackening around the orbit.
In addition, some people like to rub their skin hard in the bath in order to wash it more cleanly, but they don't know that rubbing too hard or repeatedly can also lead to skin blackening, which is called friction melanosis.
Mainly due to the mechanical stimulation of local skin caused by intense friction and oppression, the light brown to dark brown pigmentation is diffuse and reticulate, and it is high in bone processes such as clavicle, ribs, scapula, elbow and knee.
Extended data:
Do a good job of skin whitening.
First of all, when you go out in summer, you should pay attention to sun protection and avoid exposure. When going out, you should wear sunscreen, a sun umbrella, a sun hat and colorful T-shirts to keep out the sun.
If you spend a day in the sun outside, you should wash your face with cold water, shrink pores, make your skin cool, and achieve the effect of eliminating heat and returning to red. If you wash your face with hot water, the capillaries will dilate and congestion, appear patches of flushing, and even grow sunburn.
Secondly, eat less foods rich in the above elements that can make the skin black. Not eating food containing additives can make the metabolism in the body normal and let melanin be discharged smoothly.
Eat more fruits, such as cherry, litchi, guava, etc. Or other seasonal fruits such as watermelons, grapes, pineapples, pears, peaches, etc., which are abundant in summer and rich in vitamin C. More intake can make the skin white and flawless.
In addition, green vegetables such as white radish, carrot, asparagus, mushroom, bean sprout, cucumber and wax gourd all contain vitamins A, C, E and protein, which are indispensable for whitening skin.
Third, we should pay attention to skin care. Treat the skin gently, and don't rub the skin too hard when taking a bath; You can make your own whitening mask according to your different skin types, such as egg white mask.
Pay attention to replenish enough water to the skin in summer, which can make the skin tender and fair, especially if you drink a glass of water every morning and add some honey or lemon juice to the water, the whitening effect will be more obvious.
If we want to have beautiful skin, we should also pay attention to our health. We must keep a regular routine, a healthy diet, moderate exercise and a happy mood in life.
Regular participation in sports activities can promote circulation, make the skin get more nutrition, increase the skin's ability to inhale oxygen, which is very beneficial to skin maintenance. Moreover, exercise is conducive to the discharge of waste in the skin, making the skin smoother, especially after sweating a lot, which can play a role in cleaning the skin.
At the same time, exercise can adjust emotions, keep physical and mental pleasure, and achieve the beauty effect from the inside out.
References:
Phoenix Net-There are three factors that induce skin blackening.