NCIt definition : A benign hair follicle neoplasm with trichoblastic differentiation. It usually presents
as a solitary papular lesion It most often presents on the head and neck area, but
it may develop in any anatomic site containing hair follicles. Because of its benign
nature, treatment usually is not required, provided that the diagnosis has been established
with certainty.;
Alternative definition : CDISC: A benign hair follicle neoplasm with trichoblastic differentiation.;