--just means the condition of the nerve fibers from the samples taken.

Mine, for example, showed "extensive swelling and and above average degree of branching", which is often indicative of a small-fiber destructive process.

And, that "overbranching" might also lead to an intraepidermal nerve fiber density above the 95th percentile in some people with an ongoing damage process.

I think what is found here is often very dependent on the stage of the neuropathic process being experienced when the skin biopsy is done. If one has it done during an acute episode, one is more likely to find swelling and excessive branching. If one has it done after that, or after a long-term chronic process, one is more likely to find reduced nerve fiber density. The distinction is between nerve fibers in the process of dying and nerve fibers that are already dead and disintegrated.