Is it safe to swim in a pool or ocean after the drain site has scabbed over?

The best person to evaluate your readiness to swim would be your surgeon.  While it is common to see the skin completely sealed under a scab, there can also remain a small opening that might preclude your body's readiness to swim.  In addition, you should discuss with your plastic surgeon how rigorous of a swim you can take given the surgery you had.

Best advise is to call your chosen surgeon to ask this question. Dr Salma is available for your post op questions. In my practice scabbing could mean open wounds...