26th April 2024

A 70-year-old man presents with a persistent lesion on his lower lip.

A 70-year-old man presents with a persistent lesion on his lower lip. The lesion first appeared as a small, rough patch 8 months ago and has gradually increased in size. He reports occasional bleeding and local discomfort. He has a history of extensive sun exposure and smokes 10 cigarettes a day. On examination, the lesion is 1 cm in diameter, with a raised, erythematous border and a central ulcerated area. There is no palpable lymphadenopathy.

Which is the most likely diagnosis?