• (n.) The act of producing pustules; the state of being pustulated.
The formation or the presence of pustules. ... (05 Mar 2000) ... 
(pus″tu-la´shәn) the formation of pustules; see also pustulosis.
Pus·tu·la'tion noun [ Latin pustulatio .] The act of producing pustules; the state of being pustulated. 
Type: Term Pronunciation: pŭs′tyū-lā′shŭn Definitions: 1. The formation or the presence of pustules.
pustulation 1. The development of pustules. 2. Breaking out into pustules.
the formation or breaking out of pustules.