Hi
If it was darker, I would say it was a splinter haemorrhage but it’s looks too pale for that, so I’m not sure. Is it darker in reality, than it looks on the photo ?
My fingernails go paler in the middle, when I outstretch my fingers, somehow the underlying tissue becomes devoid of blood but it usually goes all the way across the nail. Could this be happening to your nail but unevenly ?
Regards
Barbara
(UK)