



Is the line gradually widening? It may be a fungal infection if it is. It could also be due to an old injury.
Hi Marina, thank you for replying.
The line sometimes partially disappear and after a while reappears. The groove that the line is in remains the same. From the photo that I took yesterday the line seems to have become thinner. I’ve never injured my thumbs though. It’s weird. I don’t even know if I should consult a dermatologist or podiatrist.
It might be an idea to see a dermatologist, or even your GP if you are in UK. You may be asked to to a clippings test of your nails. Just to test for any underlying fungal issues. Strange that it keeps disappearing and reappearing.
I appreciate your suggestion! I’ll begin by consulting a GP. Thank you again.
do come back on here with the diagnosis. Very interesting.