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A necrotic spider bite like that of the recluse family (loxoceles) or hobo family (tegenaria) can leave this type of mark which may grow in size but other insects can leave black marks in the central puncture/ wound site like wasp or hornet stings, ant bites, etc. Have it seen for evaluation.
Color changes. Little white marks (leukonychia) often appear after minor injuries. They may last for weeks or months and usually go away on their own. It is common for a nail to turn black after an injury. The black or purple-black color is caused by blood under the nail and will go away as the injury heals.