A 54 year old man presents with a 24 hour history of right-sided chest pain. He feels it is superficial and burning in nature. He has a history of Type 2 Diabetes Mellitus and he is prescribed Metformin and Sitagliptin. On examination, he has a linear vesicular rash just below the nipple which only affects the right anterior chest wall. He is haemodynamically stable.
Based on the likely diagnosis, what is the most appropriate management option?