My last neurologist did a skin punch biopsy on both of my lower legs about 3 years ago, which turned into my wife having to rush home early from work, and the paramedics having to be called because they botched the test. It's something I'll never forget.
The test results were normal, I don't have small fiber neuropathy, I was diagnosed with idiopathic poly neuropathy a few weeks later.
Is small fiber different, is it treatable? I don't know because I don't suffer from it.