A 60-year-old male presents to the emergency department with a new rash for the past three days. Rash was initially erythematous and now it changed to a 4 mm blister which has progressively increased in size. On exam there is no mucosal involvment. The bullae are flaccid with a positive Nikolsky's sign. What is the most likely diagnosis? 

A. Pemphigus Vulgaris

B. Bullous Vulgaris

C. Stevens Johnson Syndrome

D. Erythema Multiforme

E. Staphylococcal Scalded Skin Syndrome

Answer: A - Pemphigus Vulgaris

Read more Here.