After the cold weather, Aunt Zhao Fei cellophane, who lives in Fuzhou, started to worry about “rotten corners of the mouth” again. However, this time, the rotten corners of the mouth are a little different. In previous years, the corners of the mouth were dry and cracked, but this time there were three or four small blisters at the corners of the mouth, which would break, crust and fall off after a few days. If you accidentally touch the blisters while eating or talking, it will hurt. Auntie Zhao applied a lot of lotion to the corners of her mouth, but the symptoms did not improve. She went to the dermatology department for an examination and learned that this time she had herpes simplex, whereas in the past she had keratoconjunctivitis. The actual fact is that you can find a lot of people who are not able to get a good deal on this kind of things. In the fall and winter, many elderly people’s corners of the mouth either dry and cracked, or blisters, sometimes coated with lip balm does not work. In fact, both herpes and keratitis can cause the corners of the mouth to break out and become painful, but they are completely different conditions. Herpes is caused by the patient’s infection with the herpes simplex virus, which usually does not develop when the virus is hidden in the ganglia, but develops when the seasons change and the person’s immunity decreases due to the cold. Herpes mainly appears as clusters of small blisters around the mouth and lips. Stomatitis, on the other hand, is an infection caused by the cold weather that tends to dry out the mucous membrane of the skin around the lips and corners of the mouth, and the surrounding germs take advantage of the situation. In addition, reduced dietary intake of vitamins, resulting in a lack of B vitamins in the body, can also lead to the occurrence of vitamin B deficiency keratitis. Because keratitis is mostly caused by dry climate that leads to chapped skin, applying some moisturizer can relieve the symptoms. If you have herpes simplex, it is best to keep the herpes area out of water and not to use lotion. In addition, there are special medications for herpes, so people should not apply cosmetics. It is important to emphasize that when herpes simplex occurs, the ruptured blisters are highly contagious and it is best not to kiss others, especially children, at this time. Do not give personal items such as lipstick to others either.