If you need to wear a mask for a long time, it is recommended that you apply lip balm several times in a timely manner before and after wearing the mask or in between removing the mask to prevent dry and cracked lips. Before going to bed, you can apply olive oil and paste milk powder, acting as a lip mask, absorbed on the lips for more than 20 minutes, and then wiped off. At the same time, add more water, eat more fruits and vegetables, especially pears, water chestnuts and other foods that have the effect of generating fluids and nourishing yin, to relieve the symptoms of dry and cracked lips. In addition, drink more water to provide moisture to your lips. If the symptoms of chapped and crusted lips do not heal for a long time, you should go to the hospital as soon as possible to find out the cause of the disease and treat the symptoms.