Erysipelas begins as a small erythematous patch that progresses to a fiery-red, indurated, tense, and shiny plaque. The lesion classically exhibits raised sharply demarcated advancing margins. Local signs of inflammation, such as warmth, edema, and tenderness, are universal. Lymphatic involvement often is manifested by overlying skin streaking and regional lymphadenopathy. More severe infections may exhibit numerous vesicles and bullae along with petechiae and even frank necrosis. With treatment, the lesion often desquamates and can resolve with pigmentary changes that may or may not resolve over time


This is not the case here since the cheek is not warm .
Erysipelas is an local infection that has all the classical symptoms : "calor , rubor , dolor .... " of an inflammatory condition.
The rapidly developing condition has me confused but I would go for trauma