pustulant

from The Collaborative International Dictionary of English v.0.48

Pustulant \Pus"tu*lant\ (?; 135), a. [L. pustulans, p. pr. See
   {Pustulate}, v. t.] (Med.)
   Producing pustules. -- n. A medicine that produces pustules,
   as croton oil.
   [1913 Webster]