The clinical differential diagnosis for trichofolliculoma includes dermal nevus, basal cell carcinoma, and pilar sheath acanthoma
. These cutaneous entities may be ruled out by histopathology.
Histopathological differential diagnoses of NC include: trichofolliculoma, dilated pore of Winer, pilar sheath acanthoma
, and folliculocystic and collagen comedo hamartoma .
The benign tumors are: Trichofolliculoma, Pilar sheath acanthoma
, Fibrofolliculoma, Trichodiscoma, Trichoepithelioma, Trichoblastoma, Trichoadenoma, Pilomartricoma, Trichilemmoma, Trichilemmal horn and Proliferating trichilemmal cyst.