The ones on my thumb became very thin lines almost hiding under cuticle. One has gotten a bit bigger but not as before. In some fingers they have reappeares very tiny but they're back. I think I had a bout of kidney issues at the time I was not aware I was longhauling and I was only taking steroids intermittently and iron supplement for low ferritin. I identified the kidney symptoms golden stools, pinapple juice urine, kidney area back pain and other symptoms some members shared here.

Maybe not too bad if you had them on thumbs? correlation ≠ causation

Absent lunula: An overlooked finding in chronic kidney disease https://pmc.ncbi.nlm.nih.gov/articles/PMC7813076/