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Cutaneous fibroses induced by Borrelia burgdorferi

Three cases of chronic intection with Borrelia burgdorferi are descrihed. The patients presented with nodular or discoid fibrosis, partly in conjunction with acrodermatitis chronica atrophicans (ACA). Juxta‐articular fihrotic nodules may develop within a few months of the onset of ACA. Nodular, discoid morphoea‐like, and widespread cutaneous fibroses in chronic Borrelia infection may be provoked by trauma, surgery or electromagnetic radiation. They respond well to antibiotic therapy. These lesions offer an in vivo model for studying the evolution of immunologically induced fibrosis.