I have a dark line under my thumb nail running from the top to about the middle of the nail bed. Two months ago I noticed it because it started hurting pretty bad. The pain went away about two weeks later. It has now returned and the pain is worse then before. What is this?
It is possible that it is a blood vessel. . Because there is limited space under neath the nail, any vessel can be painful. I would suggest seeing your primary doctor to see if you need referral. Meanwhile, try tylenol or anti inflammatory medicines like Ibuprofen (take with food only and avoid if you have chronic kidney disease, previous bleeding from the gut, or severe reflux) for pain.