I had root canal, i suppose i'm fine. there was no other facial swelling. it's only a small abscess too. and would this tooth need to be extracted now?

Likely no...: Usually a root canal is done to preserve a tooth that you intend NOT to extract. There is a high likelihood that additional care will be necessary to preserve the tooth (such as a build-up and a crown). While there remains a possibility of failure, talk with your dentist to address the specifics in your case.

See your dentist: If you have a small abscess after root canal, this could be a sign of complications and possibly of a root canal failure. See your dentist for re-evaluation x-rays and treatment options.