The scan does the whole body. It is really hard to tell the heart to only respond to "yelling" from one part.
It is quite likely that the detox is cleaning some garbage out of that fatty tissue, which may include some pathogen infectious agent. Letting it work is probably the best answer, although I know it can be painful at times.
Some warm towels, etc., over the area may increase blood flow to the area of the leg to assist in carrying "junk" away.
For more information please check this link: