parapsoriasis

[păr′ə-sə-rīə-sĭs]
n.
  1. A chronic dermatosis of unknown origin, with erythematous, papular, and scaling lesions appearing in persistent and often enlarging plaques.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.