Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
păpŭla, ae, f. dim. [root pamp-, pap, to swell; in Gr. πομφός; cf. 2. populus], a pustule, pimple, Cels. 5, 28, 18: ardentes, Verg. G. 3, 564: eruptiones papularum, Plin. 20, 7, 26, § 67: rubentes papulas sanare, id. 26, 11, 73, § 120; Vulg. Lev. 14, 56.
Prov.: papulas observatis alienas obsiti plurimis ulceribus, i. e. you see the mote in your brother’s eye, but not the beam in your own, Sen. Vit. Beat. 27.
păpŭlo, āre, v. n. [papula], to produce pustules or pimples, Cael. Aur. Tard. 2, 1, 3, 4.