Skin Punch biopsy depends on the doc.
I had one done on the 2nd visit to my neuro at Johns Hopkins.
Not being a diabetic, I guess its part of the intake diagnostic procedure.
Mine was taken at 3 sites- ankle, calf & upper leg towards the hip.
A positive result of SFN - axonal, sensory, length dependent, polyneuropathy.
Good news/bad news.
Nerve regrowth is evident.
Nerve degeneration is faster than the regrowth.
Treatment?
Rx's for pain & symptoms, check-ups annually at first, as needed- later.
My PCP is also part of the Hopkins system (as well as all of my docs)
& she is the one that follows-up.