Source : Webster's Revised Unabridged Dictionary (1913)

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

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.

Source : WordNet®

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