Major thigh swelling after BBL on 11/25. Should I be concerned? (Photo)

It is not uncommon to have swelling in
your thighs. The fluids from the procedure settle in the legs due to gravity.
Also, the stress response of the surgery with anesthesia can cause overall body
fluid retention. What is worrisome and deserves a work up for DVT would be pain
or tenderness in the leg, unilateral swelling, warmth or redness, which your
plastic surgeon will screen for in your follow up.

It is common to have general swelling after any type of surgery. With gravity swelling will move down. You should be able to visit or follow up with the nurse after surgery if your surgeon is on vacation. 

Common things being common, I would say that most likely it is a result of the compression garment and the movement of fluid downward based on gravity.  It will likely resolve in a couple weeks after the garment is discontinued.  However, even if your plastic surgeon is out of town, someone should be able to address your concerns.  No good surgeon goes out of town a couple days after a BBL and doesn't have someone that can see you if need be.  Take care and good luck.