Should I be worried about the stitches pulling apart or is it common in this type of procedure? When should I begin to worry?

I am 4 weeks post-op of an aggressive medial thighplasty. Swelling has been horrible, even though I'm keeping off my feet and my legs elevated. My stitches has begun to pull apart in a few places. I'm applying Silvadene cream daily and keeping stitches completely covered. The wounds do not seem to be deep, maybe just a few layers. No tissue is protruding, just a little indented. I thought I would be healed enough by now for the stitches to be secure enough.

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