A swelling containing pus; an abscess. 'an impostume in his breast' 'the patient was dangerously ill of an imposthume'

What is impostumes?

noun. a localized collection of pus formed as the product of inflammation and usually caused by bacteria.

What does imposture mean?

1 : the act or practice of deceiving by means of an assumed character or name. 2 : an instance of imposture.