The winter weather is dry and many people are prone to “ragged” corners of the mouth, which many people used to or even now think is due to “fire”, but in fact the cause of rotten corners of the mouth is not simple. The two are completely different diseases, and both can be caused by stomatitis and viral infections that lead to herpes. The fact is that each person’s corner of the mouth is different, some are dry and cracked, some grow a cluster of blisters at the corner of the mouth, bursting with pus out, in fact, the former may be dry weather-induced corns, the latter is herpes simplex virus infection caused by herpes, the two are completely different. If it is corns, you can apply moisturizer to relieve the symptoms, and in severe cases, if there is pus flowing from the infection, you can apply some antibiotic ointment, and pay attention to a balanced diet, eating more fresh green vegetables, etc. The first time you get infected with the herpes simplex virus, you are in direct or indirect contact with the person carrying the virus, such as kissing, using other people’s utensils, lip balm, etc. After getting better, it can be latent in the body, and can recur when the body resistance is low, treatment needs to be given topical or oral antiviral drugs to shorten the course of the disease and reduce the possibility of transmission, the dosage and specific time need to follow the doctor’s advice. Regardless of what causes the corner of the mouth to break, never lick with your tongue, it is easy to break. Also be sure to take rest, eat a balanced diet, and increase vitamin intake. Conditions such as exposure to cold, staying up late, and mental stress can lower the body’s immunity, which in turn can aggravate it.