Hi, I am struggling to find info on what may cause this. Actually it is my mom, not me. Each lunula on each fingernail looks bruised... but there has been no trauma to the nail. The toenails look fine. She is in good health, only on a low dose of an antihypertensive (lisinopril) for slight high BP. She has no other health complaints, and it wondering what this may be from (she used to take colloidal silver... but I heard that would make the lunulas look slate blue) But they look bruised! Has anyone heard/experienced this before?