The Collaborative International Dictionary of English v.0.48:

Prurigo \Pru*ri"go\, n. [L., an itching, the itch, fr. prurire
   to itch.] (Med.)
   A papular disease of the skin, of which intense itching is
   the chief symptom, the eruption scarcely differing from the
   healthy cuticle in color.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prurigo
    n 1: chronic inflammatory disease of the skin characterized by
         blister capped papules and intense itching