hi there, by leakage you mean that you have incontinence
then that could be due to weak anal sphincter which could be a result of polypectomy
, or child birth or just old age. You may be having an anal fissure
or fistula along with it which is causing the burning sensation or the soiling or both.,visit a surgeon and get the cause sorted out. The conditions can be treated to a great extent by surgical procedure and so you might get some relief after that.Take care.