Despite widespread awareness of the most classical clinical presentation with central clearing of erythema migrans, a pathognomonic sign of infection with Borrelia burgdorferi, diagnosis of other forms of erythema migrans remains more difficult. We describe a case of a patient with secondary lesions of erythema migrans that within three months formed a complicated pattern and affected at last nearly the entire lower limb of the patient. In addition, the erythema appeared to be posture-dependent in the way that the lesion was with central clearing in the supine and with homogeneous appearance in the upright position. The borrelial infection was confirmed by PCR sequencing that detected DNA of B. afzelii in the skin biopsy specimen. The lesions disappeared during antibiotic therapy. This case shows how posture can be important in the examination of patients with a suspected erythema migrans.
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