An older adult presents with a pearly-domed nodular looking lesion on the back of the neck. it does not hurt or itch. he does not know how long he's had it. what is the most likely etiology?

Basal cell carcinoma .

Explanation:

Cancer may be defined as the uncontrolled division of the cell that might occur due to mutation. The different type of cancer are  carcinoma, sarcoma and leukemia.

The basal cell carcinoma depicts the skin cancer cell that occur due to the mutation in the cell responsible for the production of new skin cell. This cancer is generally occur due to the areas that are directly exposed to the sun especially in the neck.  These cancer can cause nodular like lesion.

Thus, the answer is basal cell carcinoma.