Phenomenology and Epidemiology of Trichotillomania and Skin-Picking Disorder

Abstract This chapter highlights the diagnostic features and clinical characteristics of trichotillomania, skin-picking, and nail-biting and their diagnostic distinction from obsessive-compulsive disorder (OCD) and other conditions. Nonclinical forms of these disorders are described. Information on the prevalence and limitations of epidemiologic research is discussed. The gender ratio, age of onset, longitudinal course, functional impairment, and healthcare utilization are described for each disorder. The cross-cultural features of the disorders are highlighted, and patterns of psychiatric comorbidity are discussed. Additionally, the chapter briefly discusses the relationship between the disorders and psychotic conditions.