index finger is brown just under nail and on the sides.  I am seeing a doctor, but he is running kidney tests.  Doesnt seemed too concerned about discoloration.  Im a worrier and naturally I feel this is a sign of something bad.  I have had kidney disease when I was quite young. Thank you.
Hi, Thanks for asking. Based on your query, my opinion is as follows.1. Brown pigmentation under nail would indicate old injury with absorbing blood. If all nails were involved, systemic disease like kidney cause could be possible. 2. As you have a history of kidney disease in young, the doctor is running kidney tests to assess the function at present.3. Not to worry now. Correlation with renal function tests is essential. Hope it helps. Any further queries, happy to help again.