Dermatology Questions? Ask an Online Dermatologist.
Can you attach the photos here? How old are you? Are you a male or female? How tall are you? How much do you weigh? Any medical problems? Any surgeries? Any medications including over-the-counter pills and herbs? Any family medical history?
Since it doesn't have fistula and it was very painful, I think it is perianal abscess rather than anorectal fistula. Since it was drained, the area should be cleaned by frequent sitz baths or hand-held showers. You don't need to have surgery.