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The differential diagnosis of cicatricial alopecia includes a wide variety of diseases. A 60-years-old woman was admitted to the hospital because of an unsuccessfully treated, progressive pseudopelede of Brocq. Further examination revealed an borreliosis (Stage III). After 3 weeks of treatment with intravenous Cefotaxime (Claforan), follow-up examination one year later show an complete arrest of the alopecia. This first description of cicatricial alopecia to be causally related to borreliosis Stage III extends the differential diagnosis of pseudopelede of Brocq and offers a curative therapy.