Re: black line growing downward on my big toenail
A splinter hemorrage is simply a void in the nail plate cell production from the matrix or root. The void will fill up with blood from the nail bed and look much like a tiny splinter underneath the nail. If this particular nail constantly creates the same 'missing' cells from within the matrix, the 'splinter' will continue to appear. Once the nail developes in this manner, the splinter can continue to return with regularity, or never again. If the 'splinter' looks like it grows forward with the nail plate and eventually grows off the free edge, it really isn't anything to worry about. If the splinter grows in a straight line with no breaks in the line from the cuticle to the free edge, it could very well signify a malignant growth in the matrix. If it is a continuous line, you should see your physician to rule out malignancy.