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We here describe a patient with a tick bite in the areola mammae in 1953 followed by erythema migrans. Twenty years later, after another tick bite in the axillary skin, also followed by erythema migrans, a large lymphatic infiltrate developed in the mammary skin, when the margin of the erythema reached the areola. The infiltrate resolved within a year without any therapy. Borrelial DNA was detected by polymerase chain reaction in the paraffin blocks of the lymphatic skin infiltrate. The patient died 9 years later of generalized lymphoma. A similar monoclonal immunoglobulin heavy chain gene rearrangement was detected both in the mammary skin lesion and in the lymphoma specimen.