Trichostasis Spinulosa consists of several fasciles of retained vellus hairs in the hyperkeratotic sebaceous follicles, resulting in a dark slightly raised horny follicular spines. resembling comedones on the trunk and face.
The condition in relatively common, particulary among the aged, but is usually overlooked on routine skin examination as the patient is rarely aware of it. We report 6 cases of trichostasis spinulosa, which showed numerous asymptomatic tiny black
comedo
like dots on their backs.
We obtained the follicular material by tweezer, which consisted of several vellus hairs surrounded by a keratinous plug.
Histologic examination was cone in 3 patients. one whom showed a rarely reproted double follicle and double papilla.
With scanning electron microscopy, we observed multiple vellus hairs embedded in a keratotic plug, emerging from a hair follicle opening.
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