The red area around human lips is called "lip red edge", and its wettability is maintained by local abundant capillaries and a small amount of underdeveloped sebaceous glands. In low humidity and windy weather, the blood circulation of human skin and mucosa is poor. If you eat less fresh vegetables and have insufficient intake of vitamin B2 and vitamin A, it will dry and crack.

In order to moisten lips, some people like to lick their lips with their tongues. In fact, this is a bad habit, because licking your lips can only bring temporary wetness. When the water in these lips evaporates, it will take away more water inside the lips, so that your lips will fall into a vicious circle of "dry-lick-dry-lick again", and the result will be more painful and cracked. In addition, saliva also contains amylase and other substances. When the wind blows, the water evaporates and takes away the heat, which lowers the temperature of the lips. Amylase sticks to the lips, which will cause the deep connective tissue to contract and wrinkle the lip mucosa, thus drying more severely. In severe cases, it will be infected and swollen, causing pain.

There is no need to panic in this case. First of all, we should get rid of bad lip licking habits. Secondly, drink plenty of water and eat fresh vegetables, pears, water chestnuts and other foods that can nourish the body and nourish yin. Of course, you can also take vitamin A or B at the same time, and you will recover soon.