A 58-year-old man presented with a non-healing ulcer on his lower lip which had been present for nearly six months or longer. The patient reported that he felt no discomfort or pain. He denied smoking or alcohol use and could not recall any trauma to the area of ulceration. He used to spend prolonged hours in the sun due to his work without using any sunscreen. He was not on any medications and always had routine dental care. He had no other health-related issues.
No abnormal findings were noted in his head and neck region. His vital signs were also normal, and no palpable lymph nodes were detected. However, an ulcerative lesion was observed in the vermilion of her lower lip that measured one centimeter in diameter. The lesion's periphery had raised indurated borders and appeared as a crater-like defect. What is your probable diagnosis for this patient? (Answer is posted in the…
