What word or phrase does your mother always say?
early 15c., from Middle French purulent and directly from Latin purulentus "full of pus," from pus (genitive puris) "pus" (see pus). Related: Purulence.
purulent pu·ru·lent (pyur'ə-lənt, pyur'yə-)adj. Containing, discharging, or causing the production of pus.