Vertical line going down nail?

Patient

Q: My index fingernail has this single dark line going down the middle of it, its been there for years and i dont recall it being bruised by anything. Now my thumb seems like to have a line too. Maybe its because of i buff my nails alot? I reguarlly keep up with nail care. It is it something i should be concerned about? I do have somewhat servre eczema for all of my life, mainly focused onto my hands but never bothers my nails.

Symptoms:  None
Images: 
Vertical line going down nail?-1
Doctor

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