Erythroderma is a potentially fatal dermatologic emergency that is often mistaken for infection. Indeed, the fact that it is difficult to diagnosis is the main contributor to its significant mortality rate, as treatment is readily available. We present a case of a 36-year-old man who was incorrectly diagnosed and treated for 2 months. We review the etiologies, initial work-up and management of this disease. In our case, the patient was ill, had lost 11.3 kg and developed systemic inflammatory response syndrome. Without proper treatment he was at risk of developing full-blown sepsis. Although there are many causes of erythroderma, prompt initial treatment directed at the underlying etiology typically results in a rapid remission.