Good idea you are going through Igenex for testing. But it would also be very wise to get to a Lyme Literate Medical Doctor. Even if the test comes out negative they go on clinical symptoms. I tested negative through Igenex couple of times. Then finally after years of treatment it came out positive. So get to a LLMD that knows what they are doing.
There are 2 threads above, Lyme Newibies and How to Share Doctors Names. They will help guide you in finding one.
With the fat atropy, we all show many many different symptoms. So yes, it could be a sign of lyme.