Often also referred to as dry lips, chapped lips are a common condition that most people will experience. A more severe form of chapped lips is called labyrinthitis, which is also caused by an infection. The human lips are not like the skin and other parts of the body that contain sebaceous glands. When the weather changes, there is a lack of moisture in the air and the lack of moisture will make the lips dry and cracked. If the air temperature is low in winter and the air humidity is low, it will lead to dry and cracked lips, and direct sunlight in summer will make dry and cracked lips more serious. Also the cause of dry and cracked lips may be caused by frequent licking of the lips, the saliva from the tongue further deprives the lips of moisture. Severe dry and cracked lips can lead to bleeding lips, which can cause the wound to become infected with bacteria, which can lead to lip infection. Dry and cracked lips can also be caused by dehydration or malnutrition, dehydrated people are in a state of dehydration, so the lips will be dry and cracked; malnutrition symptoms are also due to the lack of nutrients in the body, the lips will show the body condition, so the lips will appear dry and cracked. When dry and cracked lips are serious, there will be very serious problems, so in daily life, we should pay attention to keep the lips moist, adjust the humidity of the air in the environment, you can prevent dry and cracked lips.