Thanks for the query.
Usually scar of cesarean section done last year may not give trouble now.
But as you are saying that there is congestion at the scar area, there could be some disruption of collagen
If you are having severe pain
, better to go to emergency room now.
If not, you can take analgesic
to control the pain and consult gynecologist as early as you can.
Meanwhile better to take rest and avoid strenuous activities.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429