From your description that this dark spots travel up the nail, i think that they might be in the nail itself unless you mean that you disappear and go to new positions.
This might not be splinter hemorrhages at all.
Keep me posted about what your doctor said.
i posted another reply to your other post.
Thank you very much for using our website http://doctorslounge.com
and i hope that this information helped.
Yasser Mokhtar, M.D.