Dry lips and rotten corners of the mouth are suffering from chronic lipitis and xerostomia, which are mostly caused by the lack of vitamins and trace elements in the body. Due to picky eating, partiality, resulting in the body of B vitamins, vitamin C deficiency or trace elements in the lack of iron and zinc, it is easy to suffer from chronic lipitis. Chronic lipitis patients will lead to dry, flaky, cracked lips, and even erosion. If the external environment is particularly dry, such as in the northern winter, the outside world is cold, dry, wind can also induce chronic lipitis. The sun is particularly strong many people are sensitive to ultraviolet rays, which can also cause over-sunlight exposure type of lipitis, which can also make the lips dry and bleeding. Some people in the corners of the mouth after flaking will habitually use the tongue to lick the corners of the mouth, lick the lips, with the hand to tear the skin of the lips, will induce further aggravation of local inflammation.