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A member asked:
White semi-crusty horizontal lines on toenails from cuticle to just above lunula. some nails have it more than others. no diabetes, blood work ok.
A doctor has provided 1 answer
Fungus or Trauma: Horizontal lines are usually an indicator of chronic trauma but can also be caused by fungus. I recommend you see a dermatologist to have them evaluated.
Answered 9/29/2016
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