Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pustŭlo, āvi, ātum, 1, v. a. and n. [pustula].
pūsŭlātus and pustŭlātus, a, um, adj. [pusula and pustula], blistered, i. e. refined, purified: argentum pusulatum, Dig. 19, 2, 31; also, argentum pustulatum, Suet. Ner. 44; Mart. 7, 86, 7.