Hello doctor! My friend is experiencing an acute pain inside his anus opening. He is unable to even sit properly and it is very difficult to pass motions. There seem to be some boil inside the opening which is causing this. In fact it is little swollen also if you probe inside. From the outside nothing is visible. A few days back also he had experienced the same thing but that was only for a day or two. However then the boil was relatively outside and was reddish. He had applied betnovate c cream then and it was fine. But this does not seem to be working this time and he is in a very bad condition. It is paining a lot. Request your help.