A 60-year-old man has noted the appearance of a nodule on his ear during the past month. On physical examination, there is a 1.2-cm, flesh-colored, dome-shaped nodule on his right ear lobe. The nodule has a central keratin-filled crater surrounded by proliferating epithelium. The lesion regresses and disappears within 1 month. What is the most appropriate diagnosis of this lesion?
□ (A) Squamous cell carcinoma
□ (B) Basal cell carcinoma
□ (C) Seborrheic keratosis
□ (D) Actinic keratosis
□ (E) Keratoacanthoma
□ (F) Verruca vulgaris
