pimpling1
/ˈpɪmplɪŋ/ /ˈpɪmp(ə)lɪŋ/noun
1The presence of pimples; the fact of being covered with pimples.
2 Metallurgy. The presence or development of small round swellings on a metal or other surface.
Origin
Late 16th century. From pimple + -ing. Compare slightly later pimple.
pimpling2
/ˈpɪmplɪŋ/ /ˈpɪmp(ə)lɪŋ/rare
adjective
That is erupting in pimples, pimply; that causes pimples or goose pimples.
Origin
Early 17th century; earliest use found in Tobias Venner (1577–1660), physician and medical writer. Originally from pimple + -ing; in later use also from pimple + -ing. Compare pimply and earlier pimpled.