I had a single thin reddish/brownish line that was in my thumbnail in 2004 or 2005 but it kept on appearing and disappearing with cutting of nail. But since last one or two years, I am noticing that this line has become permanent and also increasing in length. Other than that, there are two more lines now visible next to it. So now there are three lines and I am worried as more might become visible (I have noticed some more extremely small dot like formations that I am sure will grow). Not only this, a few days ago I also saw a dot sized reddish/brownish appearance under the nails of my right index and little finger which disppeared in few days.

I am extremely worried. What's the cure?