I was severely burned by Bodytite which gave me a huge, festering blister. What caused this?

Next day a HUGE, clear yellow liquid filled blister appeared on my leg. It was AWAY from the suture where canulla was inserted but was in an area where the heated canulla moved around. More than 10 days later it is still actively oozing nonstop. My bodyfat was only 11% at time of procedure and I am a woman, I just did it for radical skin tightening. Does Bodytite use a grounding plate placed on the patient to prevent heat from arcing the way cauterizing tools do?