Breast tissue very rarely re-grows -- especially in four months. If you were satisfied with your initial appearance (even with the swelling), then the tissue you have now is probably some scar tissue/swelling residual combination. Best advice: massage and be patient. Give it at least 6-8 months to settle down. Then, if you still have some firm tissue there, ask your surgeon to consider some kenalog injections to soften the scar tissue and help it disappear.
Dr Jacobs