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The purpose of this investigation was to analyze the clinical and epidemiological aspects of all cases of erysipelas and infectious cellulitis admitted to a tertiary hospital during a period of five years. All patients admitted with the main diagnosis of erysipelas or cellulitis to the Department of Dermatology of the author's institution from January 2005 to May 2010 were included. Seventy patients were identified and their medical records were retrospectively reviewed so as to record the epidemiological and clinical data. Univariate and multivariable analyses were performed to analyze variables that predicted longer length of stay. The frequency of cellulitis in the lower limbs was higher in men and patients older than 65 years. Moderate/severe cellulitis in patients with basal comorbidity followed by a poor response to oral antibiotic therapy for 48 h were the most common reasons for admission. At arrival, four patients had abscessed areas. Fourteen patients developed local complications and 18 cases developed general in-hospital complications. Most patients improved or were healed with intravenous amoxicillin-clavulanate 1 g-200 mg/8 h. Intravenous amoxicillin-clavulanate 1 g-200 mg/8 h may be a good choice for empiric treatment in our setting. The development of in-hospital complications and the need for changing empiric antibiotic therapy were significant and independent variables associated with longer length of stay.