Pustulent as an adjective is filled or oozing with pus while Purulent as an adjective is consisting of pus, or matter; partaking of the nature of pus; attended with suppuration; as, purulent inflammation.
Part of speech: adjective
Definition: Filled or oozing with pus , "producing pustules"
Part of speech: adjective
Definition: Consisting of pus, or matter; partaking of the nature of pus; attended with suppuration; as, purulent inflammation.
We hope you now know whether to use Pustulent or Purulent in your sentence.