Tumour necrosis factor-α [TNF-α] inhibitors have revolutionised the management of chronic inflammatory conditions. A number of cutaneous adverse events have been reported with TNF inhibition, including vasculitis. Most reactions are mild and rarely warrant treatment withdrawal. Here we describe a patient with Crohn’s disease treated with adalimumab in whom severe multivisceral Henoch-Schönlein purpura developed, including neurological involvement, requiring definitive TNF blocker withdrawal.

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<b><i>Background:</i></b> Hidradenitis suppurativa (HS) is a chronic inflammatory skin condition substantially impacting patients’ quality of life; the pathogenesis remains unclear, and treatment is complex and not yet standardized. Observational data are increasingly being used to evaluate therapeutics in “real-life” interventions, and the development of e-cohorts is offering new tools for epidemiological studies at the population level. <b><i>Objective:</i></b> The aim of this study was to describe the clinical characteristics and treatment history of HS participants in the Community of Patients for Research (ComPaRe) cohort and to compare these to other cohorts. <b><i>Methods:</i></b> We performed a cross-sectional study of the baseline data of HS participants in ComPaRe, an e-cohort of patients with chronic diseases. Data were collected using patient-reported questionnaires about clinical-dem­ographic aspects, quality of life, and treatment history. <b><i>Results:</i></b> A total of 396 participants (339 females, 57 males) were included (mean age 38 years); 83 (21%) had a family history of HS, 227 (57.3%) were current smokers, and 241 (60.9%) were overweight or obese. Most of the participants declared a Hurley stage II (<i>n</i> = 263, 66.4%) or III (<i>n</i> = 76, 20.3%). The breast was more frequently affected in women than men (37.5 vs. 5.3%, <i>p</i> &#x3c; 0.0001), whereas the dorsal region was more frequently affected in men (39.5 vs. 10.9%, <i>p</i> &#x3c; 0.0001). Increased disease stage was associated with obesity (25.9 vs. 33.8 vs. 51.3%, <i>p</i> = 0.02) and some HS localizations (genital [<i>p</i> &#x3c; 0.005], pubis [<i>p</i> &#x3c; 0.007], gluteal fold [<i>p</i> = 0.02], and groin [<i>p</i> &#x3c; 0.0001]). The most frequently prescribed treatments were oral antibiotics (<i>n</i> = 362, 91.4%), especially amoxicillin-clavulanic acid and cyclins. Less than 10% of participants received biologics. Most of these results were consistent with previously published cohorts. <b><i>Conclusion:</i></b> Recruitment of participants by such a web platform can be a faster way to get relevant scientific data for a wide variety of patients that could be used for epidemiological studies and to evaluate therapeutics in “real-life” interventions.

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