ImportanceResearch on the prevalence of barriers to care among sexual and gender minority (SGM) patients with chronic inflammatory skin diseases (CISDs) in the US is limited.ObjectiveTo compare the prevalence of cost and noncost barriers to care among SGM and non-SGM patients with CISDs and to analyze the prevalence of barriers based on SGM status and race and ethnicity.Design, Setting, and ParticipantsA cross-sectional study of health care access and utilization survey data collected by the National Institutes of Health’s All of Us Research Program between May 31, 2017, and July 1, 2022, was conducted. Participants were adults aged 18 years or older with CISDs who enrolled in All of Us directly online or through partner health care practitioner organizations located across the US.ExposuresChronic inflammatory skin diseases, sexual orientation and gender identity, and race and ethnicity.Main Outcome and MeasuresThe main outcome was the experience of cost and noncost barriers to health care among SGM patients with CISDs. Multivariable logistic regression was used to examine the association of SGM status with experiencing barriers to care.ResultsThis study included 19 743 patients with CISDs; 1877 were SGM patients (median age, 40.5 years [IQR, 28.7-57.9 years]; 1205 [64.2%] assigned female sex at birth) and 17 866 were non-SGM patients (median age, 57.1 years [IQR, 40.8-68.1 years]; 13 205 [73.9%] assigned female sex at birth). Compared with non-SGM patients, SGM patients with CISDs were significantly more likely to delay specialist care (adjusted odds ratio [AOR], 1.23; 95% CI, 1.03-1.47), mental health care (AOR, 1.62; 95% CI, 1.37-1.91), and filling a prescription (AOR, 1.30; 95% CI, 1.11-1.52) because of cost. In addition, SGM patients with CISDs were significantly more likely than non-SGM patients to delay care because of transportation issues (AOR, 1.49; 95% CI, 1.22-1.80) and not having a health care practitioner who shares the same background with regard to race and ethnicity, religion, native language, sexual orientation, and gender identity (AOR, 1.39; 95% CI, 1.19-1.62). Sexual and gender minority patients with CISDs were also significantly more likely than non-SGM patients to report not always being treated with respect by their health care practitioners (AOR, 1.47; 95% CI, 1.30-1.65).Conclusions and RelevanceThe findings of this cross-sectional study of survey data suggest that SGM patients with CISDs may be disproportionately affected by cost and noncost barriers to health care. Dermatologists and other health care practitioners caring for SGM patients with CISDs have an important role in helping to address these barriers and larger systemic issues for SGM patients at both the patient and system levels.