A 67-year-old patient consulted a doctor about a formation on his upper lip on the left, which appeared two months ago. Objectively: on the border of skin and vermilion border of the upper lip on the left there is a roundish cone-shaped formation up to 1 cm at the base, narrowing towards the apex, up to 1.3 cm high, gray, dense, painless. What is the most likely diagnosis?