A middle aged man complains of a node which has been growing on his nose for several months. Now it’s firm with central depression. It is 0.6cm in size. What is the single most likely diagnosis?

The key is A. Basal cell carcinoma. [A pearly white umbilicated ulcer (with central depression) any where in the face with rolled edges / inverted edge is basal cell carcinoma. Any ulcer which is located above the neck is always basal cell carcinoma until proven otherwise. (Samson note)].