I have never heard of this test. Very interesting. I had 2 punch biopsies, after my emg was negative, they can back positive. It took me over 2 years to get diagnosed. The EMG will be negative unless you have large fiber involvement. I am 35, otherwise healthy. Believe to be idiopathic. It’s now spreading up my legs. The weirdest thing is this new visual on the bottom of my feet. Anyone had these before? I attached a picture below. They are not brown or black like it may appear in the picture. They are bright orange and yellow. Happened over night and have been there for about a week now.

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