“…Psychiatric disorders are often comorbid with onychotillomania, namely depression, anxiety, and psychosis. In 29 onychotillomania cases, eight were associated with depression with or without psychosis [ 48 , 49 , 50 , 51 , 52 , 53 , 54 ], four with general anxiety disorder, adjustment disorder, or specific phobias [ 2 , 55 , 56 ], and two with psychosis and hypochondrial delusions [ 57 , 58 ]. In one case, there were no psychiatric comorbidities, and for the remaining 14 cases no psychiatric evaluations were performed [ 59 , 60 , 61 , 62 , 63 ].…”