Who is the appropriate Dr who can understand issue better and help accordingly?
Which medical specialist should be consulted for anal polyp?
A physician specialised in disorders of the colon, rectum and anus might be the person of choice.
This could be a proctologist (a physician specialised in proctology), or if this speciality is not recognised/available in your country, this could be a colorectal surgeon. In some cases (depending on the size of the anal polyp) a gastroenterologist can also handle anal polyps (through endoscopic removal).
I would suggest seeing the surgeon who diagnosed this anal polyp and discuss further management with him.