History:

Trichostasis spinulosa is a common disorder of the hair follicles that clinically gives the impression of blackheads but the follicles are filled with funnel-shaped, horny plugs wrthin which are bundles of vellus hairs that result from retention of telogen hairs, which are derived from a single hair matrix due to a hyperkeratosis of the follicular infundibulum, which leads to a partial obstruction of the follicular orifice and thus does not pemrit shedding of small telogen hairs.