A seroma is a build-up of clear, straw-coloured fluid in the implant pocket. Small seromas are common after surgery and often settle on their own.
Early seroma
Minor fluid collections in the early weeks usually resolve without treatment. Larger ones causing swelling or discomfort may be drained.
Late seroma matters
A seroma that appears late — months or years after surgery, particularly causing one-sided swelling — should always be investigated, because late fluid around a (especially textured) implant can be a sign of BIA-ALCL. Investigation typically includes ultrasound and sampling of the fluid.
What to do
Report any new or persistent breast swelling to your surgeon, especially if it develops well after recovery.