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10 Subtle Signs of Dangerous Health Problems Your Feet Can Reveal

Black spots/lines under toenails

A straight line under your toenails

It could be: Skin cancer

Of course, if someone stepped on your foot or if you stubbed it, you may develop some discoloration under your toenail(s). But if you notice some black or brown discoloration under your toenails that occur without reason, you should visit your doctor. These are a common sign of melanoma, which is a cancer of the skin.

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