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Nail scrubbing. Finger nails being scrubbed clean with a nail brush. The person is probably suffering from obsessive-compulsive disorder (OCD), a neurosis. OCD can take the form of repetitive tasks, the patient feeling anxiety when they perceive themselves not to be clean. The disorder can be treated with psychoanalysis or behavioural therapy, although severe cases may need antidepressant drugs. (KEYSTONE/SCIENCE PHOTO LIBRARY/CRISTINA PEDRAZZINI)