For old anal fissures, you can use nitroglycerin ointment for application under the guidance of a doctor, or you can use nifedipine gel and botulinum toxin for treatment. You can dry the affected area in time after cleaning it, then take a small amount of red rose dan and spread it directly onto the affected area, and apply it with a plaster and then wrap it, or you can make a medicine twist directly with other medicines. However, for old anal fissures, the effect may not be particularly good if only treated with medication, so in addition to using the relevant medication for treatment, you also need to do anal care to prevent constipation and maintain hygiene. If medication does not work, you can also go to the hospital for surgery.