DefinitionLichen simplex chronicus is a skin disorder that leads to chronic itching and scratching.Causes, incidence, and risk factorsThis disorder may occur with:Eczema (atopic dermatitis)PsoriasisNervousness, anxiety, depression, and other psychologic disordersIt is common in children, who chronically scratch insect bites and other areas. It can also be common in mentally retarded children who have chronic repetitive movements.SymptomsThis skin disorder leads to a scratch-itch cycle:It may begin with something that rubs, irritates, or scratches the skin, such as clothing.This causes the person to rub or scratch the affected area. Constant scratching causes the skin to thicken.The thickened skin itches, causing more scratching, which causes more thickening.The skin may become leathery and