Sarahalmost 7 years ago

This person got bitten by a spider, but little did he know that it had been a recluse spider. Leaving it untreated, allowed the venom to cause this lesion. Scientists say this venom contains a rare protein that can cause a lesion, or a much less common, but more dangerous, systemic reaction in humans. The most common response is inflammation that after one to two days can develop into a "dark lesion" surrounding the bite site. The blackening, or "necrosis", of the skin is dead skin cells, evidence of the immune system's efforts to prevent spread of the toxin by preventing blood flow to the affected area.