A double bubble can be due to many reasons, some of which have been highlighted in previous posts. I would recommend you visit with your surgeon to communicate your concerns.
One of the common reasons why a double bubble may manifest following removal of scar tissue (capsulectomy) from your procedure is possible violation of the inframammary crease. Another reason would be a "band" manifesting in the lower pole of the breast. This can be due to scar tissue or residual capsule formation.
Regardless, I recommend you visit with your surgeon who is familiar with your case and he/she will make the best recommendations.

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