“…Severe SP causes noticeable tissue damage, can be time-consuming, and often causes significant distress or impairment in physical, social, or occupational functioning. The severity of functional impairment has been documented in reports of individuals spending several hours daily digging deep into the skin (Benjamin, & Buot-Smith, 1993;Pusey, & Senear, 1920), sometimes with even life-threatening severity (O'Sullivan, Phillips, Keuthen, & Wilhelm, 1998). To be classified as primary severe SP, the behavior should not be accounted for by another psychiatric illness, such as a delusion of parasitosis, dementia, or mental retardation (e.g., Prader Willi Syndrome).…”