WebSep 30, 2024 · A black toenail is usually caused by a toenail injury, such as when something heavy is dropped on top of it. When blood pools up beneath the nail, it can appear red, blue, black, or purple. More rarely, a black toenail can be caused by malignant melanoma (cancerous cells), fungal infection, chronic ingrown nails, or diabetes. WebSep 27, 2024 · Toenail melanoma is a rare cancer that develops underneath the fingernail or toenail. You can also get toenail fungus from the overgrowth of fungi in, under, or on …
Nail Changes Types of Nail Changes - American Cancer Society
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How to Treat a Black Toenail: Causes & Treatments - wikiHow
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