That is a good point Ides, in order to be able to have a diagnosis, which is important and in some cases vital to being found disabled by a private insurer or social security, you may need to get testing done to arrive at that diagnosis. Skin biopsy I would have no problem doing if i had to, sural nerve biopsy no way. I had a spinal tap done to avoid a sural nerve biopsy. I would thinkt hat the results of your skin biopsy should be enough to prove that you have PN.