skin disorders
Lichen Simplex Chronicus
Introduction
Lichen simplex chronicus is chronic, itchy inflammation of the top layer of the skin caused by repeated scratching, rubbing, or both. Lichen simplex chronicus involves a cycle in which scratching provokes itching, which provokes more scratching. It most often affects skin areas that are easier to reach, such as the upper chest, arms, neck, legs, and genital area, and often does not affect skin areas that are more difficult to reach, such as the mid to upper back. Corticosteroids applied to the skin and measures to relieve itching help, but people should avoid scratching and rubbing the skin. (See also Overview of Dermatitis .) Lichen simplex chronicus is caused by chronic scratching or rubbing of an area of skin. The act of scratching triggers more itching, beginning a vicious circle of itching-scratching-itching. Sometimes the scratching begins for no apparent reason. Other times scratching starts because of a Contact Dermatitis or other condition, but the person continues to scratch long after the inciting cause is gone. This persistent itch may involve changes in the way a person's nervous system perceives and processes itchy sensations. Lichen simplex chronicus frequently occurs in people who have anxiety disorders and emotional stress. People who have Atopic Dermatitis (Eczema) , 