I have a strange line cutting my right thumbnail in half, from top to bottom. I have a large lunula (moon) which takes up a third of my nail,. The line begins at the bottom of the lunla and is reddish brown till it reaches the top of the moon and then the line becomes white right to the top. It literally draws a line dividing my nail in half. The nail itself is hard and doesn't physically split. I've had this for about 2 months now. Any ideas?
