[Lymphocytoma--a borreliosis?].

4 patients suffering from lymphocytoma had been observed for a mean of 1.75 years (13 to 21 month). The lesions were located on the ears; all patients developed regional lymphadenopathy. Two patients experienced headaches of short duration, one child showed six erythema migrans lesions, and another child had an elevated IgM level of 322 mg/dl. A tick bite was noted in one child. Indirect immunofluorescence tests revealed significantly elevated IgG or IgM antibody titers against Ixodes dammini and Ixodes ricinus spirochetes in all patients. Serological evaluation may be helpful in differentiating borrelial lymphocytoma from other pseudolymphomas.