Hi... This is Dr.Harsha,consultant Gastrointestinal and Minimal access Surgeon from Bangalore, From the description that you have provided that I understand that you are suffering from an anal fissure... anal fissure is caused due to passage of very hard stools which has caused injury to the the anal opening resulting in a wound which we call as fissure ... I need to confirm the diagnosis Once by seeing the area affected... many other conditions such as a thrombosed external hemorrhoid for a fissure with abscess can give rise to the condition... simple fissure in ano can be managed by medications but an abscess or a thrombosed hemorrhoid needs urgent intervention.. Please consult me once so that I can get to know better about your disease in order for me to prescribe the correct  treatment..