Hi , i have a longitudinal brown band in both thumbs , i think i already have this since I was a child , and since I m afraid of doctor I never had any consultation till I work after college , i thought it is due to some cardio problems but I was diagnosed with mild mvp and the doctor said it has nothing to do with it. After several years , the nails bothered me because I always felt ashamed because of this. Perhaps i already have this for 19 years if i remember correctly. Do you think this is something serious? I hope it s benign, and could it possibly become normal in color? Because this really affects my self-esteem.