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I emailed a photo as Mama Lynn suggested. This is the reply.
"Occasionally we see a temporary lump forming at the surgery site, which is a mild reaction around the muscle layers and internal stitches.
As long as it is not painful to touch, not oozing fluid and not getting
bigger, then it should be nothing to worry about. It will disappear
gradually over the next week or two."
The swelling has gone down.
If you do notice any of the above, then we will get her in for assessment.