Any thoughts on what would cause this black line? Right thro | Figure 1

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Any thoughts on what would cause this black line? Right through nail bed. Patient states has been there for about 10 years. No trauma to nail. Unchanged in as many years. Weak spot in nail, causing nail to split.

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24 year old female. Left thumb #nail with presentation above. No other nail involvement. 2 year duration. No trauma. No previous treatment. Washes hands regularly due to work environments (stewardess). Seldom applies Gelish to nails. Picks at nail due to distal splitting. No reported nail biting. What could the DX possibly be? What would cause the split and the red vertical ridge down the nail?

diagnosis? Patient saw many professionals in the medical field who keep saying it is fungal but on appearance the fungus was distal to the nail along the nail bed, and medial lateral nail corners. Nails were brittle. Suspect years of trauma to nails causing them to thicken with slight #Onycholysis. Any further suggestions? Patient is fit and healthy but nails were yellow on presentation.

70 yr old male presenting for totally unrelated issue. I noticed his nails incidentally. Anyone know what causes this?](https://app.figure1.com/case-detail/2fa564d6-7d47-4a69-b7d2-1fbe0d4f52f9)

Young girl with white nails without any complaints. Diagnosis? Cause? Treatment?](https://app.figure1.com/case-detail/3df253ce-85ff-4afa-b553-e726add634cd)

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