Toenail "breaks" and then restarts growing (picture inside)

Hi! I have a problem with a toenail. It started almost in july 2013. It keeps breaking and like leaving spaces and then it continues to grow, and also there is a black hard thing slowly growing in the outer corner.

Hi! I have a problem with a toenail. It started almost in july 2013. It keeps breaking and like leaving spaces and then it continues to grow, and also there is a black hard thing slowly growing in the outer corner.

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Toenail "breaks" and then restarts growing (picture inside)