Thank you for the query.
Your symptoms can be caused by urinary tract infection
, abscess in abdominal cavity or soft tissues infections in the incision area. Moreover, mentioned conditions can coexist.
surgery usually causes wound infection
during infected appendix removing, some of such wounds do heal longer than other wounds. If such wound gets infected, usually fever appears (hot cheeks and lips can indicate fever). The wound gets hard and painful. Discharge from the wound can be present.
is possible after every surgery and if fever appears, it should be always ruled out.
I suggest you to visit you doctor, have abdominal ultrasound
, soft tissues ultrasound, blood work, CRP and urine analysis performed.
Hope this will help.