Hair follicle neoplasm Trichoepithelioma 2017-02-20T14:24:28Z A benign hair follicle tumor whose tumor cells form rudimentary hair follicles but not actual hair shafts. A trichoepithelioma is usually less than one centimeter, firm, round, and shihy with yellow, pink, brown, or bluish color. They may occur multiply, usually on the face, and may gradually increase in number with age.