pustule

The pustule on the fore finger shews the disease in an earlier stage.

Little white specks appear upon the wool, and are soon followed by a small pustule at the root.

As well might you account for the smallpox by saying that the first pustule was the cause of the disease.

Pustule, pus′tūl, n. a small pimple containing pus: anything like a pustule, on plants or animals: a small blister.

It attacked the horse and cow as well as the sheep, and human beings died of it when they developed malignant pustule.