Rotten lips are usually caused by chronic lipitis, herpetic lipitis, etc., as follows: 1, chronic lipitis: often caused by the lack of vitamins and trace elements in the body, especially when due to the lack of B vitamins in the body, it is easy to cause chronic lipitis. In addition, if the patient himself has bad habits, such as long-term lip biting or tearing the skin of the lips with the hands, is also very easy to cause chronic labiitis, chronic labiitis, the main symptoms of dry cracked lips, flaking, serious symptoms will lead to secondary bacterial infections of the lips, resulting in lip erosion and redness and swelling, in the treatment of the earliest possible medical treatment, at the same time, to give up the bad habits, to ensure that the body of vitamins and trace elements of the supplementary 2, herpes labiitis: the disease occurs in the corners of the mouth, the corners of the mouth first blisters, blisters break out after the appearance of lip erosion, in this case to carry out antiviral treatment, you can take oral antiviral medication, in addition to the corners of the mouth blisters in the parts to be coated with acyclovir this kind of antiviral ointment for treatment.