| Re: black lines undeneath my nails
If the lines run from under the proximal nail fold all the way to the free edge, then yes, they could very well be a sign of a cancerous growth in the matrix. When these are present, they are usually surgically removed and the end result is a permanently damaged Matrix with apparent damage on any emerging nail plate. These growths can be malignant or benign, but the only way to tell is to remove one and have a biopsy performed.
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