Figure 2. (A, B) Histopathology of the tumor confirmed the lesion was a pilomatrixoma. Low-power photomicrograph of the histopathology of a vaccination site-associated benign pilomatrixoma in a 65-year-old man. Fragments of dermal tissue include basaloid cells (dark blue) derived from the hair follicle that forms the cyst wall. The pilomatrixoma contains acellular keratin (pink). There is a granulomatous inflammatory response to keratin but no acute inflammation or abscess formation. Hematoxylin and eosin (H&E). Magnification ×20.