However, a review of the scientific literature by Jenkins et al. on excoriation disorder as a separate category in the DSM-5 concluded that such a distinction requires more evidence. Because excoriation disorder is different from other conditions and disorders that cause picking of the skin, it is important that any diagnosis of excoriation disorder take into account various other medical conditions as possible causes before diagnosing the patient with excoriation disorder. There are a variety of conditions that cause itching and skin picking including: eczema, psoriasis, diabetes, liver disease, Hodgkin's disease, polycythemia vera, systemic lupus, and Prader-Willi syndrome.