I'm not sure how long ago you had your stitches, but if it was recently, I would be concerned about an infection/abcess. If that is what is going on, it will continue to get bigger and more painful. It will be very important to go in to the doctor to have it lanced and get some antibiotics.
If your delivery was quite some time ago, it could still be an infection, or it could be something else like a sebaceous cyst or endometrioma. Either way, the treatment will probably be the same; it will probably need to be lanced and drained.
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