photodistribution

[fō′tō-dĭs′trə-byōōshən]
n.
  1. The areas on the skin that receive the greatest exposure to sunlight and are involved in eruptions due to photosensitivity.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.