What's already known about this topic?• The prevalence of psoriasis in children is lower than adults • A significant number of adults with psoriasis first developed skin disease in childhood • Genetic and environmental factors both play an important role in the onset of psoriasis • Disease associations, such as obesity, are an important area of current research activity
What does this study add?• Mapping has shown a dramatic increase in the number of published studies over the past 25 years • Studies have been concentrated in Europe, Asia and North America; these studies have largely been case series or cross-sectional studies • Specific studies with standardised methodologies are needed to provide data on the frequency, clinical presentation, risk factors, associated diseases and long-term outcomes for child-onset psoriasis
The Epidemiology of Childhood Psoriasis: A Scoping Review AbstractPsoriasis is an inflammatory non-communicable skin disease which affects both adults and children. At present the epidemiology and natural history of psoriasis are not widely understood. This scoping review aimed to map the existing literature on the epidemiology of child-onset psoriasis, provide a comprehensive, clinically useful review and identify research gaps for future studies.Search strategies were developed for OVID MEDLINE, OVID Embase, Google Scholar and hand-searching; 131 articles meeting the inclusion criteria and were mapped and 107 articles were included for data extraction.Over 25 years there has been a dramatic increase in the volume of published observational epidemiological studies on child-onset psoriasis. The majority were case series or crosssectional studies, concentrated in Europe, Asia and North America. The prevalence of childhood psoriasis was found to be higher in European countries, older children and females. Up to 48.8% of children had psoriasis in a first degree relative. The most frequent subtype was plaque psoriasis and initial site of presentation is most commonly scalp, limbs and trunk. Specific genetic differences have been found between the child-onset and adultonset populations. Case-control studies and cohort studies investigating risk factors for psoriasis onset, comorbidities and long-term health outcomes were extremely limited.The choice of study design and heterogeneity in methodology limit the validity and generalisability on the information, consistency of the results and comparability of the studies. Well-designed studies are needed to provide precise and consistent information about the frequency and clinical presentation, risk factors, associated diseases and longterm outcomes in child-onset psoriasis.