Is it normal that my toenails are getting darker in places?

My toenails have started to turn darker in places and washing is making no difference. I'm only twenty so it can't be an aging thing surely?

Voting Results
23% Normal
Based on 13 votes (3 yes)
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Comments ( 1 )
  • Boojum

    Nail fungus?

    https://www.mayoclinic.org/diseases-conditions/nail-fungus/symptoms-causes/syc-20353294

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