pru·ri·go 
(pr-rīgō)
(pr-rīgō)n.
A chronic skin disease having various causes, marked by the eruption of pale, dome-shaped papules that itch severely.
[Latin prūrīgō, an itching, from prūrīre, to itch; see preus- in the Appendix of Indo-European roots.]
pru·rigi·nous (-rĭjə-nəs) adj.