An eschar is a coal-black scab associated with which disease?

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An eschar is a coal-black necrotic crust that forms at the inoculation site in cutaneous anthrax. After Bacillus anthracis enters the skin, a painless papule develops and progresses to a vesicle that necrotizes, forming the characteristic black eschar with surrounding edema. This coal-black scab is distinctive for cutaneous anthrax and helps separate it from other conditions listed: malaria and dengue cause fever and various rash patterns without a necrotic eschar, while smallpox produces a vesicular-pustular eruption with crusts but not a single coal-black necrotic lesion.