The aim of this study was to analyze possible connection between the lichen planus and imbalanced concentrations of serum lipids and to evaluate the impact of various dietary regimes (used in the regulation of imbalanced concentrations of serum lipids) on the regression of lichen planus lesions. Research was conducted as a case-control study comprised of 72 patients with Lichen Planus and 30 participants from control group, treated at the Clinic for Dermatology and Venereology of the Clinical-Hospital Centre Osijek, Eastern Croatia, during 2010 and 2011. LP cases were diagnosed with both a clinical examination conducted by a dermatovenerology consultant and by patohistological diagnostic. Serum lipid levels (total cholesterol, LDL-cholesterol, triglycerides, HDL-cholesterol) were determined by the classic laboratory diagnostics in both investigated groups (LP patients and control group). The present study has confirmed that there is a strong connection between the imbalanced concentrations of one or more serum lipids (cholesterol, HDL-cholesterol, LDL-cholesterol, triglycerides) and the occurrence of LP which is important in the therapeutic approach to patients with this disease.