Final answer:
The likely diagnosis for the described symptoms of hot, tender, shiny, red plaques on the face is Erysipelas, an infection typically caused by Streptococcus pyogenes.
Step-by-step explanation:
A patient presenting with hot, tender, shiny, red, sometimes edematous sharply marginated plaques on the face is most likely experiencing Erysipelas. This condition is characterized by an intense, inflamed patch of skin that involves the dermis, commonly on the legs or face, and is often caused by Streptococcus pyogenes. The infection can lead to a bullous form of erysipelas, which is suppurative, presenting with large, inflamed areas and is sharply demarcated, aligning with the symptoms described.