An 80-year-old male is referred for Mohs surgery by his primary care physician for “a basal cell carcinoma” on the left nasal sidewall. The lesion has not yet been biopsied. During your initial evaluation, you note a 0.8 cm, ulcerated and erythematous papule on the left nasal sidewall. You perform a biopsy with frozen sectioning. Based on the histopathology, what is the most likely diagnosis?