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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.
Confidence votes 11.7K. Almost all insect bites or stings leave welts, if they have the horsepower to break the skin. If it's not a chemical blend they inject to make feeding easier, their saliva can also cause a localised allergic reaction. The bite should be expected to increase for a few hours, and then decrease in size and effect in 1-2 days, although some stay longer.