OBJECTIVE: Seborrheic dermatitis (SD) is a chronic, recurrent inflammatory skin disease characterized by clinically scaly patches. It is known that skin diseases with chronic inflammation are associated with comorbid conditions such as metabolic syndrome, obesity, cardiovascular diseases (CVD) and diabetes. In recent years, there are studies investigating the relationship of SD with metabolic syndrome, hypertension, obesity and nutritional factors. However, there is no study evaluating body composition parameters in SD patients. In the light of this information, it was aimed to evaluate the relationship between SD and body composition parameters. METHODS: The study was conducted on a total of 78 participants, including 39 SD patients over the age of 18 and 39 age- and gender-matched control patients, who applied to the University Faculty of Medicine Dermatology outpatient clinic. Body composition parameters were measured for each participant with the Tanita MC 580 Body Analyzer. In addition, SD area severity ındex (SDASI) was calculated in the SD patient group. These parameters were compared between the case and control groups. RESULTS: There was no significant difference concerning height (p=0.208), weight (p=0.309), body mass index (p=0.762), fat mass (p=0.092), metabolic age (p=0.916), body density (p=0.180), mineral (p=0.699), visceral adiposity (p=0.401), protein (p=0.665), and other body composition parameters, between the case and control groups. There was only positive correlation between SDASI and height (p=0.026) and protein (0.016) value. CONCLUSION: SD may be associated with obesity, metabolic syndrome, insulin resistance, and CVD, but the results are unclear and further studies are needed.