Gangrenous erysipelas (e.gangraenosum) is a rare human streptococcal disease. It is accompanied by hyperemia, swelling, pain and erosive elements on the face or neck. On the skin of the face you can see blisters with sanguineous contents; after they are opened, ulcers are formed filled with purulent exudate. Another name - phlyctena streptococcus - is due to the fact that