Case scenario 27 year old male patient presents with a painf | International surgical boards

Case scenario

27 year old male patient presents with a painful ulcer in the lower lip (photo shown above) since 4 days back, the patient has a history of a similar ulcer in the mucosal aspect of the cheek several years ago which resolved spontaneously without treatment, the patient is also a smoker for nearly 12 years.

Q1: Provide differential diagnoses?

Q2: What is the most probable single diagnosis in this particular case?

Q3: What are the important aspects of history to ask about in this particular patient?