Erysipelas is an acute infectious skin disease caused by Group B beta-hemolytic streptococcus. The bacteria often invade the body through minor skin injuries, causing localized skin redness, swelling, and pain. Some patients also experience systemic symptoms such as fever and headache. Erysipelas commonly occurs on the face and lower legs. Erysipelas on the face is mostly caused by bacterial invasion due to bad habits such as otitis media, dental caries, and nose picking, while erysipelas on the lower legs is often caused by secondary infection from athlete's foot. People with low immune resistance are more prone to erysipelas, so it is crucial to use sensitive antibiotics in adequate amounts early in the treatment.