The main causes of skin dullness are as follows.
One, melanin deposition

A lot of us, sunscreen is not in place, resulting in melanin deposits in the skin, because after being exposed to ultraviolet light, will lead to the epidermis of the skin, and even the dermis will be damaged, which will lead to your skin becomes dull, rough, and the skin is prone to aging.
For this kind of problem, it is necessary to do a good job of sun protection all year round. Many people only skincare, forget to do the last step of sun protection, but this step is very important, at the same time, if the sun is relatively large, you can use more tools, umbrellas, hats, sunscreen clothing, more help to resist UV rays.
In the use of skin care products, you can choose more vitamin C, vitamin e dried fruit and other ingredients to help the skin to lighten melanin.
Two, keratin oxidation

In fact, it is one of the main causes of skin yellowing or darkening, why?
It is inevitable that the human body is oxidized, environmental pollution, poor rest will allow the body to form some free radicals, that free radicals it will lead to rough skin without luster.
For this, we should choose more antioxidant skin care products, at the same time, eat more strong antioxidant effect of vegetables or fruits.
Three, the accumulation of waste keratin
You can properly exfoliate the skin to remove excess keratin, oil, grease dirt, while using some whitening and hydrating products.

Fourth, the skin is dehydrated
If your skin is dehydrated for a long time, it will also make the skin become relaxed, aging, no luster, delaying the normal metabolism of the skin cycle, resulting in pigmentation, skin dullness.
Daily, do a good job of skin hydration and water retention, acute hydration when dehydrated, you can often wet compress or two to three times a week a mask hydration, at the same time, you can also use some whitening effect of the product to improve this skin dull and yellow problem.

Five, the internal causes of the body
Insufficient qi and blood will also cause metabolic problems, it is not only the body metabolism is not smooth, the skin will also metabolism is not smooth.
Some people may feel that the body is insufficient qi and blood, but they may be more difficult to distinguish a little, the following three points can be numbered to analyze their own.
1, if the usual liver fire is relatively strong, liver stagnation, will also lead to yellowing of the skin.
Because the liver metabolizes all the toxins in the body, if your liver fire is more vigorous, liver stagnation, in fact, your skin will be more yellow.
2, lung Qi deficiency, what does lung Qi deficiency mean?
It may be difficult for many people to distinguish, the lungs are the main skin, lung deficiency often manifests itself in the throat, cough or rhinitis, these represent a relatively deficient lung, will also cause our skin is not good.
3, the spleen and stomach function is poor
This is generally very accounted for a large proportion of the South in particular, relatively heavy dampness, many people’s spleen and stomach function will be relatively poor, will also lead to the skin is also relatively dull, no luster.
This is the main reason why the body three cause skin dull yellow.

All the overall skin dull yellow, basically these few problems, you can check to see where their own problem points, check to improve.