The Collaborative International Dictionary of English v.0.48:

Pustulate \Pus"tu*late\, v. t. [L. pustulatus, p. p. of
   pustulare to blister, fr. pustula. See Pustule.]
   To form into pustules, or blisters.
   [1913 Webster] Pustulate

The Collaborative International Dictionary of English v.0.48:

Pustulate \Pus"tu*late\, Pustulated \Pus"tu*la`ted\, a.
   Covered with pustulelike prominences; pustular; pustulous;
   as, a pustulate leaf; a pustulate shell or coral.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pustulate
    adj 1: (of complexion) blemished by imperfections of the skin
           [syn: acned, pimpled, pimply, pustulate]