For a tattoo on the hip or buttock after a BBL, I would generally wait until the area is fully healed, swelling has settled, and your surgeon has cleared you. For many patients this is at least 3 months, and for a larger tattoo directly over treated areas, waiting closer to 6 months is often more conservative. The reasons are skin sensitivity, swelling, risk of irritation or infection, and the fact that the transferred fat and final contour continue to settle for months. A tattoo placed too early can also be harder for the artist to position accurately if the shape is still changing. Do not tattoo over any incision, irritated skin, numb area, or area that still feels firm or swollen. Ask your BBL surgeon at your follow-up visit, because the safest timing depends on your healing and exactly where the tattoo will go.