After Tummy Tuck and Lipo, 3 weeks later I got hot on the left side and sciatic pain, should I be concerned?

Thanks for your question and congratulations on completing your
surgery.  I would definitely follow up
with your Plastic Surgeon to see what could be going on.  Best of luck. 

I recommend following up with your Doctor for a formal evaluation to determine the cause of the pain and pain management. Pain can be treated with oral neurontin. You also have swelling, which can last 3-6 months after your procedure. I recommend adding hyperbaric oxygen and lymphatic massage along with your compression to help decrease swelling. To improve your final results, I also recommend adding vanquish for further fat removal, exilis/venus legacy for skin tightening, cellutone/z wave to make the skin smooth, remove scar tissue, and improve the skin’s appearance. See an expert. Best, Dr. Emer

I think you have a disk issue that is exacerbated by the bent position you usually are in during recovery.    The disk in your back is pressing onto a nerve and that pain is radiating down to your buttock and leg.  I would see a back specialist and notify your plastic surgeon.  Best Wishes!!