Almost 2 weeks ago, I noticed a sliver of brown pigmentation just above the cuticle of my thumb. I did not remember hitting my thumb on/in anything, so I became concerned. Within a few days, it grew out to where it is now (see photo). I saw my dermatologist yesterday and, while she said it isn't overtly worrisome, she is sending me to have it biopsied.
I suppose I am just wondering if anyone has had something similar under their nail and/or what a nail biopsy is like. I am going to a specialist at UPenn to have it done. Does this look like subungual melanoma to anyone?