Cancer: Four symptoms of the disease that may show up in the feet
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The main disease in question is melanoma, one of the deadliest forms of skin cancer.
In rare cases, melanoma has been known to grow under and around the fingernails and toenails.
While everyone can develop melanoma on their nails, it’s more common in older individuals and people with skin of colour.
In such cases, the disease might appear as brown or black vertical lines under the toenail.