@birdman518, sorry to hear that you now have a new diagnosis to add to neuropathy and related issues. I'm bringing in members like @grandmar @sherilewis @gingerw who can share their melanoma experiences with you. @mlenney167 also just joined the forum and is caring for someone with melanoma.

It sounds like you're going to have a sentinel node biopsy. This article from Mayo Clinic includes a video that helps explain how it works
https://www.mayoclinic.org/tests-procedures/sentinel-node-biopsy/multimedia/sentinel-node-biopsy/vid-20084727
It is a lot to absorb. Keep asking questions: here and to your medical team. How was the melanoma on your scalp detected?