Talk to Gastroenterologist on Anal Problem

Since last 4 to 5 weeks, I feel irritation, itching and burning sensation during and after passing stool (poty) at anal opening although stool is normal. This situation persists 3 to 4 hours. In this regard I prevent from eating spicy foods but problem still not resolve. This problem starts after acute diarrhea 4 to 5 weeks ago. Kindly suggest me remedy for this problem.