I would definitely get in to see your primary care doctor
or your surgeon
just to have this checked out and make sure that this is not a recurrence of the hernia. Although hernia repair surgery
is usually very effective, there is always a risk that the hernia will recur. Your risk of having the hernia recur is also higher because of your routine of heavy weight lifting. The risk of recurrence would be highest in the first 1-2 months after the surgery, especially if you did not give yourself adequate healing time before returning to power lifting, but it could still happen at any point.
Your doctor will be able to examine the area and should be able to determine whether there is a new hernia without the need for any additional testing, although sometimes an ultrasound of the area may be helpful if there is any doubt. Based on these findings, your doctor will be able to tell you whether or not it is safe to return to your weight lifting routine.
In the meantime if you experience any sudden or severe abdominal pain or cramping in this area, this could be a sign of a strangulating hernia, and you should seek emergency medical attention.