Irritation and redness around rectum, abdominal pain - Online Doctor Chats

User :   I am a 66 year old male, 6ft3, 182lbs. generally good health, eat a well balanced low fat diet. I had surgery at birth on a fissure and full hemorroid surgery in 1982 which was successful. No visible evidence of any hemorroids or any rectal bleeding since then. About 3 weeks ago after some bike riding I developed some external irritation and redness in the skin surrounding the rectum but also some persistent pain that seems to be coming from just inside the opening and the external part looks like an open blister which has not totally healed. It gets a little better and then seems to get worse again. I have discontinued biking. Bowl movements are regular and not painful and no bleeding but the pain persists mainly when sitting or even lying down. I have had this type of problem in past years but it always went away in a few days. I also have some low level pain in the lower right abdomen which started about 2 months ago and seems to come and go. Not sure if they're related or not? Would much appreciate any suggestions as to what type of treatment I should pursue? Thanks,                                                                 
Doctor :   Hello.
Doctor :   Let me read your query.
Doctor :   I need to ask few questions first?
User :   OK, I'm listening.
Doctor :   Do you have any other symptoms? like fever.
User :   No, but my energy level is less than normal.
Doctor :   Ok.
Doctor :   Can you rate the pain from 1 to 10? 10 being the maximum pain?
User :   The pain when at its worst is about 3-4 but persistent.
Doctor :   Ok.
Doctor :   Does any thing aggravate the pain?
User :   when it started I seemed to be having excessive gas, then have been taking enzymes and pro-biotics which have eliminated the gas. If anything, sitting aggravates the pain
Doctor :   Ok.
Doctor :   Is there any soft lump protruding from the anus?
User :   checking, hold on
Doctor :   Ok.
User :   no apparent lump but rawness evident by anus, possibly like a popped blister, per my wife
Doctor :   Can you see any ulcer there?
User :   what would it look like?
Doctor :   Like a cut.
Doctor :   abrasion.
User :   yes, she says that's what it looks like, open raw sore
Doctor :   How big is it?
User :   approx 1/4 inch by anus and there was another one which is better but still evident which was a bit larger
Doctor :   Do you have any past history diabetes?
User :   no
Doctor :   Ok.
Doctor :   It could probably be a infection of skin near the anus.
User :   OK, so would you recommend any kind of treatment?
Doctor :   It would be better to get a physical examination done by the surgeon/gastroentrologist.
Doctor :   For pain you can take tylenol or advil
User :   is there anything topical you would suggest. Previously, 2-3 years ago, I was prescribed an ointment which was very helpful and it went away.
Doctor :   You can only prescribe after coming to a diagnosis.
Doctor :   It is better to get it checked first and then proceed with treatment.
User :   OK, I will schedule an appointment with a gastroentrologist. Thank you.
Doctor :   Thank for consulting healthcaremagic.
Doctor :   Bye for now.