AKT-1398

AKT-1398

An 80-year-old woman presents with sudden onset erythema of the face. Both cheeks are affected as is the bridge of the nose. The erythema began in the paranasal areas and has spread to both cheeks rapidly. The affected area is bright red, firm, swollen and painful. The edge of the erythema is sharply defined and raised. She has been feeling hot and has been shivering. No other symptoms are reported.

What is the most probable diagnosis?