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When Toes Turn Dark. Nails change colors for multiple reasons. The most common culprit for a black toenail is blood under the hard tissue. Damage to the end of the toe causes blood to leak through the nail bed and stain the keratin a dark color. This is also known as a subungual hematoma, or a bruise under the nail.
Other causes. Itching can also be related to parasites such as threadworms, insects such as bedbugs, mosquitoes, or lice. Fungal infections such as athlete's foot can also cause itching between and around the toes. Itchy skin could also be due to more serious medical conditions. Nerve disorders caused by diabetes, pinched nerves, and shingles can cause severe itching.