Obsessive–compulsive disorder (OCD) is a mental and behavioral disorder in which an individual has intrusive thoughts and/or feels the need to perform certain routines repeatedly to the extent where it induces distress or impairs general function. As indicated by the disorders name, the primary symptoms of OCD are obsessions and compulsions. Obsessions are persistent unwanted thoughts, mental images, or urges that generate feelings of anxiety, disgust, or discomfort. Common obsessions include fear of contamination, obsession with symmetry, and intrusive thoughts about religion, sex, and harm. Compulsions are repeated actions or routines that occur in response to obsessions. Common compulsions include excessive hand washing, cleaning, counting, ordering, hoarding, neutralizing, seeking assurance, and checking things. Washing is in response to the fear of contamination. Ordering is the preference for tasks to be completed a specific way (e.g., organizing clothes a specific way). Hoarding is the collecting of unnecessary objects (e.g., collecting food wrappers). Neutralizing is the act of engaging in a ritual to make up for supposedly "bad behavior". Checking is the compulsion to check particular objects/places to ensure they are a certain way (e.g., checking to ensure the water is turned off). People with OCD tend to be overly cleanly, repeatedly count objects, and seek reassurance to avoid making a mistake. Many adults with OCD are aware that their compulsions do not make sense, but they perform them anyway to relieve the distress caused by obsessions.
Pili torti (singular pilus tortus; also known as "twisted hairs") is characterized by short and brittle hairs that appear flattened and twisted when viewed through a microscope. : 638 : 764 This phenotype is noted in Menkes disease and Lichen planopilaris. Pili torti can also occur after use of retinoids, such as isotretinoin. See also
List of cutaneous conditions
Crandall syndrome

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