Background: Previous research has indicated a potential correlation between hidradenitis suppurativa (HS) and psoriasis (PSO), two chronic inflammatory dermatological diseases. However, there is a lack of comprehensive evaluations that consider a variety of clinical and demographic factors, and the risk of developing HS in PSO patients remains unclear. Our study aims to examine HS risk over time among PSO patients versus matched controls while considering the influence of confounders to provide insights into the potential link between these two diseases. Method: In this multi-institutional cohort study using the TriNetX database, we matched 202,318 patients with PSO with an equivalent number of individuals without PSO, using propensity score matching. The study period extended from 1 January 2005 to 31 December 2018. We computed hazard ratios and their respective 95% confidence intervals (CIs) to evaluate the probability of HS manifestation over a period of 5 years in patients with PSO in comparison to those without PSO. Results: PSO patients demonstrated a consistently higher risk of developing HS than matched controls across all analytic models with the hazard ratios (HR) ranging from 1.43 (95% CI 1.30–1.56) to 5.91 (95% CI 2.49–14.04). Stratified analyses showed the increased HS risk was observed in both genders but only significant in those aged 18–64 years. Kaplan–Meier analysis indicated PSO patients had a higher cumulative probability of developing HS over time (HR 1.77, 95% CI 1.49–1.89). Conclusions: PSO was associated with increased HS risk, highlighting the importance of considering HS as a potential comorbidity in PSO patients and may have implications for early detection, prevention, and management strategies for both conditions. Shared inflammatory pathways, genetic components, and skin dysbiosis may contribute. Further research should elucidate underlying mechanisms.

Background/Aim: Hidradenitis suppurativa (HS) may be linked to an elevated risk of bipolar disorder, though the precise mechanism remains unclear. This study investigated the likelihood of bipolar disorder in patients with HS. Patients and Methods: We analyzed the electronic health records of 60,850 patients with HS and 60,850 matched controls from the TriNetX network, excluding those with a prior bipolar disorder diagnosis. Propensity score matching was conducted (1:1 ratio), and hazard ratios (HRs) were calculated to assess the risk of new-onset bipolar disorder in patients with HS compared to controls. Results: After matching, the HR for developing bipolar disorder in patients with HS was 1.549 [95% confidence interval (CI)=1.270-1.889] after a 1-year follow-up, remaining significant in 3- and 5-year follow-ups and sensitivity analyses. Stratified by sex, female patients with HS showed a notably higher risk (HR=1.509, 95%CI=1.353-1.683), while no significant increase was seen in males. Conclusion: Patients with HS have a significantly elevated risk of developing bipolar disorder, especially among females. Healthcare providers should be mindful of this association when treating patients with HS.

Background: Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease, while polycystic ovary syndrome (PCOS) is an endocrine disorder. Both conditions share common risk factors, such as androgen excess and obesity. This study aimed to investigate the association between PCOS and the risk of developing HS.

Background/Aim: Gout, characterized by acute inflammatory symptoms and monosodium urate crystal deposits in joints, is prevalent among males and the elderly. Total knee arthroplasty (TKA) is a common treatment for knee osteoarthritis (OA), but its impact on the risk of developing gout is unclear. This study examined the risk of gout in patients undergoing TKA. Patients and Methods: Utilizing the TriNetX research network, a retrospective cohort study was conducted on OA patients without prior gout. The TKA cohort was compared to a non-TKA control group using propensity score matching to balance covariates. The primary outcome was the incidence of gout over a five-year follow-up period. Results: The study included 38,834 matched pairs of TKA and non-TKA patients. TKA patients had a 15.6% higher risk of developing gout (HR=1.156; 95%CI=1.042-1.284) compared to controls. Sensitivity analyses confirmed the increased risk across various models and follow-up durations. Conclusion: TKA is associated with a higher risk of developing gout, particularly in females and older adults. Clinicians should monitor and manage gout risk in TKA patients, emphasizing preventive measures and early intervention. Further research is needed to understand the underlying mechanisms and improve patient care post-TKA.