Never went away, until I started my Lyme meds, a few months ago. Only took 2-3 weeks, after starting the meds and
my nail was healed and didn't come back, until last week. I can't take the meds for fungus. Lamasil was one of those meds. Nothing I did for fungus worked. Even tried Mentholatum, but it turned the black to a yucky green and looked like moss. Used that procedure daily for months, but didn't work. This is why I'm thinking it could be Lyme related.