Psoriasis of the scalp, face, intertriginous areas, genitals, hands, feet, and nails is often underdiagnosed, and disease management can be challenging. Despite the small surface area commonly affected by psoriasis in these locations, patients have disproportionate levels of physical impairment and emotional distress. Limitations in current disease severity indices do not fully capture the impact of disease on a patient's quality of life, and, combined with limitations in current therapies, many patients do not receive proper or adequate care. In this review, we discuss the clinical manifestations of psoriasis in these less commonly diagnosed areas and its impact on patient quality of life. We also examine clinical studies evaluating the effectiveness of therapies on psoriasis in these regions. This article highlights the need to individualize treatment strategies for psoriasis based on the area of the body that is affected and the emerging role of biologic therapy in this regard. The quality of life (QoL) of patients with psoriasis affecting less common areas may be disproportionately impacted relative to the affected area (Figure 1) (Augustin et al., 2010;Sampogna et al., 2004Sampogna et al., , 2014. For example, the presence of lesions in highly visible areas can affect a patient's self-esteem, whereas involvement of the palms can make even opening a jar challenging (Janowski, Steuden, & Bogaczewicz, 2014). Nail or hand psoriasis can cause increased financial burdens due to reduced workplace productivity from disease impairment (Augustin et al., 2010;Schmitt & Ford, 2006). Using current scoring systems to measure the severity of psoriasis, such as the Psoriasis Area Severity Index (PASI) and Physician's Global Assessment (PGA), will not capture the substantial impact of disease in these regions because they do not include a specific measurement of these areas nor do they incorporate QoL measures. If using only PASI scores, for example, the location of the skin findings may not be considered and patients can be greatly affected by location versus size alone.Thus, evaluation scales were developed that specifically measure disease impact in these areas such as the Nail Psoriasis and Severity Index
| M ETH OD SPubMed literature searches were conducted with the following terms: psoriasis and face/facial, psoriasis and palmoplantar, psoriasis and intertriginous or inverse, psoriasis and genital, psoriasis and scalp, and psoriasis and nail. Abstracts from English-language articles in the last 10 years were screened for relevance.