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BackgroundAn association between lichen simplex chronicus (LSC) and sexual dysfunction was explored. However, no data are available from investigations into the relationship between erectile dysfunction (ED) and LSC.ObjectivesThis retrospective population-based cohort study aimed to clarify the risk of ED associated with LSC.MethodsBy using the Taiwan National Health Insurance Research dataset, we identified 5611 male patients who had been newly diagnosed with LSC from 2000 to 2004. The date of diagnosis was identified as the index date. LSC patients with incomplete demographic information or with a history of ED before the index date were excluded. In total, 22444 age-matched patients without LSC were randomly selected as the non-LSC group based on a 1:4 ratio. Subsequence occurrence of ED was measured until 2011. The association between LSC and the risk of developing ED was estimated using Cox proportional hazard regression model.ResultsAfter adjusting for age and comorbidities, patients with LSC had a 1.74-fold greater risk of developing ED compared with those without LSC (95% confidence interval=1.44–2.10). LSC patients with comorbidities including diabetes, hyperlipidemia, hypertension, cardiovascular disease, peripheral arterial disease, chronic obstructive pulmonary disease, chronic kidney disease, depression, and anxiety were at a higher risk of ED compared with the non-LSC patients without comorbidities.ConclusionsLSC confers a greater risk in the development of ED. Physicians should be aware of the potential of ED occurrence in LSC patients.

Coexistence of inflammatory bowel disease (IBD) in atopic dermatitis (AD) patients has been reported. The long‐term risk of IBD in AD patients remains unclear. Our aim for the study is to examine the long‐term risk of IBD in AD patients. This is a nationwide cohort study. From the National Health Insurance Research Database of Taiwan (1997–2013), a total of 36 400 AD patients were identified and matched with 364 000 reference subjects without AD by age, sex and number of hospital visits. Demographic characteristics and comorbidities were compared. Cox proportional hazards regression analysis was conducted to examine the risk of IBD. The 16‐year cumulative incidences of IBD were 0.047% (95% confidence interval [CI], 0.040–0.054) and 0.047% (95% CI, 0.025–0.096) in non‐AD and AD cohorts, respectively (P = 0.973). There were 17 cases of IBD (0.05%), including 10 ulcerative colitis and seven Crohn’s disease, among AD patients compared with 169 IBD cases (0.05%) among controls (P > 0.999). Infections (adjusted hazard ratio [HR], 2.71; 95% CI, 1.96–3.95; P < 0.001) and age (adjusted HR, 1.03; 95% CI, 1.02–1.03; P < 0.001) were independently associated with IBD, after adjusting for major comorbidities and conducting multivariate analyses. AD was not associated with IBD development. In conclusion, AD is not independently associated with IBD development.

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