Erysipelas is a particular skin infection caused by Group A Streptococcus bacterium. If left untreated it then develops into superficial cutaneous lymphatics. What happens is that a tender, very reddish and numb and well-defined plaque on the skin forms when this bacterium affects the skin. The sign which sets this apart from other skin infections, like cellulitis, is its well-defined border. Doctors assumed in the past that the only affected region is the face. However, according to National Organization for Rare Disorders, 4 out of every 5 suffering from erysipelas have the symptoms on their legs. There is also a chance for it to appear on the arms and the trunk region. If treated properly with prescribed antibiotics, it is possible for one to improve lessen erysipelas symptoms.