Keywords: C3c, complement component 3; DIF, direct immunofluorescence microscopy; EBMZ, epidermal basement membrane zone; ELISA, enzyme-linked immunosorbent assay; ELPV, erosive lichen planus affecting the vulva; IIF, indirect immunofluorescence microscopy; Ig, immunoglobulin; LS, lichen sclerosus; MMP, mucous membrane pemphigoid; SSS, salt split skin; VP, vulvar pemphigoid; autoimmune blistering diseases; direct immunofluorescence microscopy; indirect immunofluorescence microscopy; mucous membrane pemphigoid; vulvar pemphigoid.