Trichostasis spinulosa arising in isolated collagenoma of the scalp

Trichostasis spinulosa: An entity with cosmetic concern

“…TS is described in association with space-occupying lesions that constrict follicle infundibulae by tumor cells or tumor-related fibrosis, [11] such as melanocytic nevi, [12] collagenoma, [13] seborrheic keratosis, [14] syringomas, [14] follicular sebaceomas (trichofolliculomas), or nodular basal cell carcinomas. [15,16]…”