Dear Dr. Roach: In July 1998, a skin biopsy gave me a diagnosis of lichen simplex chronicus. I suffered with this for over four years, and my symptoms worsened with heat, stockings or coverings.

Understanding the Context

Ice, ... CASE #1: Lichen simplex chronicus (lichen nuchae) The diagnosis was lichen simplex chronicus (LSC), a secondary reactive process that results from scratching or rubbing and manifests clinically as ... The Globe and Mail: Regeneron and Sanofi’s Dupilumab Study: A Potential Game-Changer for Lichen Simplex Chronicus Regeneron and Sanofi’s Dupilumab Study: A Potential Game-Changer for Lichen Simplex Chronicus Nomenclature regarding the eczematous and lichenified diseases is particularly confusing and controversial. For this reason, our committee thought that it would be informative for users of the 2011 ...

Key Insights

The shape of a lichen is usually determined by the organization of the fungal filaments. [36] The nonreproductive tissues, or vegetative body parts, are called the thallus. Lichens are grouped by thallus type, since the thallus is usually the most visually prominent part of the lichen. Lichen, any of about 15,000 species of plantlike organisms that consist of a symbiotic association of algae (usually green) or cyanobacteria and fungi. They are found worldwide and occur in a variety of environmental conditions.

Final Thoughts

A lichen is a symbiotic relationship between a fungus and a photosynthetic partner (algae, cyanobacteria, or both). Lichens grow all over the world and can even survive exposure to space.