When the eschar falls off, which is usually a week or two later, it leaves a permanent scar.

CNN: "The Secret Life of Germs" author Philip Tierno

Development of many vesicles will occur, which join together, eventually rupturing, and forming an open ulcer, which, characteristically will develop a black eschar, which is like a scab.

CNN: "The Secret Life of Germs" author Philip Tierno