Hi,Post root canal if there is pain after 2 yrs it is most likely Root canal failure. It looks like there is a punctum too.. in which case there is pus accumulation due to which you have tenderness on touching.
Next Steps
Xray to be taken to see the status of root canal treated tooth.
Health Tips
if there is swelling associated, amox will not work , you will have to take higher antibiotics
-augmentin 625 mg twice a day for 5 days
- metrogyl 400 mg twice 5 days
as you are already taking penicillin I am ruling out allergy to penicillin.