1) Of skin eruptions 
red kitten as seen in Agios Georgios, Crete, Greece ...
• (a.) Covered with pustulelike prominences; pustulate. • (a.) Of or pertaining to pustules; as, pustular prominences; pustular eruptions.
pertaining to or of the nature of a pustule; consisting of pustules (= a visible collection of pus within or beneath the epidermis).
<dermatology> Pertaining to or of the nature of a pustule, consisting of pustules (= a visible collection of pus within or beneath the epidermis). ... (18 Nov 1997) ... 
(pus´tu-lәr) pertaining to or of the nature of a pustule. consisting of pustules.
Pus'tu·lar adjective 1. Of or pertaining to pustules; as, pustular prominences; pustular eruptions. 2. Covered with pustulelike prominences; pustulate. 
Type: Term Pronunciation: pŭs′tyū-lăr Definitions: 1. Relating to or marked by pustules.
pustular A reference to, or characterized by, pustules.
of, pertaining to, or of the nature of pustules. · characterized by or covered with pustules.