Every now and then, and mostly when I was a kid, I would notice little white spots on my fingernails. I still get them now, but with far less frequency.
What are those spots? Any reason why they show up when they do?
And how come I never noticed them on my toenails? (Answer: because I rarely looked at my toenails?)
Magnesium deficiency, iirc.
Remember to search Cecil’s columns archive before posting: What causes white spots on your fingernails?
Here’s a related thread: What are those white marks on your fingernails? and a New Scientist Last Word article: Why are fingernails often flecked with white? (it even mentions toenails :))
I shoulda thought of that - thanks all the same!