Dermatology Questions? Ask an Online Dermatologist.
Thank you for asking your question. Are the lines pigmented?
What is your ethnic background?
Than you. Both pictures came out too blurry to make a good judgment.
Is it possible to try again?
Thank you. Those are much better.
This is melanonychia. There are a number of factors which militate toward a benign diagnosis.
1) The fact that two nails have lines 2) the border on both lines is sharp 3) the color looks even 4) the color is not too dark 5) I do not see Hutchinson's sign ( pigment spilling out to the skin around the nail
However, despite all these benign signs, my advice would be to consult with your dermatologist. They can examine the nail pigment with a special light called a dermatoscope. This helps to better look at the lines and be sure they are normal. Also, a dermatologist should follow the pigmented lines to be sure they do not change with time.
Hopefully, a dermatologist is following you. I don't see a need to rush in Monday for an appointment but in the next month or so.
Very welcome. Enjoy the rest of the Christmas weekend.