It's cold, and my mouth turns black.

Disease analysis: the prevention and treatment of chapped lips mainly depends on eating more fresh vegetables, such as soybean sprouts, rape, Chinese cabbage, white radish and so on. Try to wear a mask and keep your lips warm and moist. You can also apply some grease, such as flour oil, sesame oil or other edible oil, or honey and chilblain cream.

Guiding opinions:

If you feel chapped lips, don't always lick them with your tongue, which will accelerate the occurrence of chapped lips. The principle of treatment is also to adjust the diet as the most important. In addition, oral riboflavin (vitamin B25 mg, 3 times a day for 2 weeks, can generally be cured. 1% Gentiana scabra can be used locally. Pay attention to eat less sweets and don't touch sugar water on your lips, because sugar absorbs water and makes your lips drier. You can't eat too salty or spicy food.