Abstract： Objective::Vulvar lichen planus (VLP), especially erosive VLP (EVLP), seriously affects women’s physiological function and quality of life. A retrospective analysis of erosive vulvar lichen planus (EVLP) was performed to raise awareness on this chronic, deforming, and painful vulvar disease.Methods::This observational retrospective study involved 40 patients with EVLP among 1,368 patients with vulvar disease from 2017 to 2020. The patients’ vulvar clinical features and extravulvar mucosal involvement were investigated. The patients’ pain and quality of life were evaluated with the numeric rating scale and the Dermatology Life Quality Index (DLQI), respectively. Clinical characteristics were reported using frequencies and proportions for categorical variables. Continuous variables are expressed as mean ± standard deviation. The association between NRS score for pain and DLQI score was analyzed by Pearson’s correlation test.Results::EVLP accounted for 2.9% (40/1,368) of all cases of vulvar disease, and the median age at onset was 42 years. Erosion mostly occurred on the labia minora and introitus. Half (20/40) of the patients had extravulvar mucosal involvement. Seventeen (42.5%) patients had oral lichen planus, and seven (17.5%) patients were diagnosed with vulvovaginal-gingival syndrome. The numeric rating scale score showed that 47.5% (19/40) of patients experienced mild pain, whereas 12.5% (5/40) described the pain as severe. Thirty-one patients (77.5%, 31/40) had dyspareunia, and nine patients had aggravated pain after sexual intercourse. The mean DLQI score was 9.1 ± 6.0, with 37.5% (15/40) of patients indicating that EVLP had severely affected their lives. The numeric rating scale score for pain was significantly correlated with the DLQI score ( P = 0.007). Conclusion::EVLP can affect the quality of women’s lives and cause severe deformations and painful architectural changes. The description of the characteristics of EVLP in this report will benefit the diagnosis and early treatment of this disease.