[Fever, cervical lymphadenopathy, and erythematous-violaceous facial plaques].

erythrocyte sedimentation rate was 30mm. Antinuclear antibodies, rheumatoid factor, and serological tests for cytomegalovirus, herpes simplex virus types 1 and 2, hepatitis B and C viruses, human immunodeficiency virus (HIV), Toxoplasma gondii, Bartonella henselae, Salmonella typhi, Brucella, Leptospira, and Francisella tularensis were negative. Serological tests were positive for Epstein-Barr virus (EBV) and parvovirus B19 immunoglobulin [Ig] G. The Mantoux test and chest radiograph were negative. Ultrasound of the cervical region confirmed lymphadenopathies. Biopsy of a node revealed paracortical areas of apoptotic cell death without abscess formation, abundant karyorrhexis, and a proliferation of histiocytes and plasmacytoid monocytes, with an absence of neutrophils (Fig. 3).