Prevalence of Metabolic Syndrome and Insulin Resistance in Adult Patients with Acne: Association with Traditional Cardiovascular Risk Factors and Acne Severity.

Introduction: Acne is a chronic inflammatory disease that affects the pilosebaceous unit, and there are conflicting evidences regarding its association with metabolic syndrome (MS) and insulin resistance (IR). Methods: A cross-sectional study was performed with 162 acne patients, over 20 years of age, matched for age and sex with 78 healthy controls without acne. The measured parameters included waist circumference (WC), body mass index (BMI), systolic blood pressure, diastolic blood pressure, fasting blood glucose, fasting insulin, high-density lipoprotein (HDL), low-density lipoprotein (LDL), triglycerides (TG), and total cholesterol. Acne severity was determined according to the Global Acne Grading System. The criteria used for the diagnosis of MS were those of the Harmonizing the Metabolic Syndrome Statement, adjusted for South Americans, and the IR was calculated using the HOMA-IR. Results: The prevalence of MS was significantly higher in cases, compared to controls (12.3% vs. 2.6%, P  = 0.014), as was the prevalence of IR (11.7% vs. 3.8%, P  = 0.047). In addition, MS and IR showed a positive correlation with the degree of acne severity ( P  = 0.011 and P  = 0.021, respectively). HDL levels were significantly lower in cases ( P  = 0.012) and showed an association with acne severity ( P  = 0.038). In the logistic regression model, the risk factor that independently influenced both MS and IR in patients with acne was the WC ( P  = 0.001). Conclusions: Adults with acne, especially the most severe cases, are significantly more likely to have MS, IR, and lower HDL levels, compared to controls without acne.