[Cough, fever and exanthema].

We report on a 29-year-old female patient who developed a dolent nodular exanthema on both lower legs after a prolonged respiratory infection of about 14 days. The chest X-ray showed a distinct enlargement of the left hilus and reduced transparency in the left upper pulmonary lobe. These findings were interpreted as pneumonia with para-infectious erythema nodosum. The serology showed IgM antibodies against chlamydia pneumoniae. Therapy with a macrolide antibiotic led to a rapidly improved general condition and also to the disappearance of the exanthema. There are some reports on single cases with erythema nodosum accompanying an infection with chlamydia pneumonia.