[Squamous cell carcinoma of the lower lip in discoid lupus erythematosus associated with hereditary deficiency of complement 2].

We report on a 48-year-old female patient suffering from lupus erythematosus associated with C2 deficiency, who developed squamous cell carcinoma on a discoid lesion of her lower lip. Vermilionectomy (Langenbec-v. Bruns' technique) resulted in a good cosmetic and functional outcome.