I'm ravi kumar I've same problem a black line in middle of my nose. Doctors say that this is hyperpigmentation this isn't any birth mark. But my mummy has this black line on her nose as well & her family members means my meternal family have the same problem. Doctors said it appeared due to ultrviloet rays of the sun. It can't remove completely & they were not sure that it might be reduce or might be not. I face embaracement just because of this. I've used BAN A TAN CREAM & TRETIN 0.025 CREAM. I was taking evion-100 MG medicines too. But I haven't seen any results yet. Please solve my problem. It can change my life & my marriage life too.