Plewig G, Wolff H H
Arch Dermatol Res (1975). 1976 Mar 10;255(1):9-21. doi: 10.1007/BF00581673.
Sebaceous filaments are cylindrical tubes of whitish-yellowish color, which can be expressed from areas of the face rich in sebaceous follicles by pinching the skin or by the cyanoacrylat-technique. Sebaceous filaments are most commonly found in the centrofacial areas and the alae nasae in postpuberal individuals with large facial pores and seborrhea. Sebaceous filaments are composed of a skeleton of 10-30 horny cell layers which enclose a mixture of bacteria, sebaceous lipid, corneocyte fragments and one hair. Following the expression of the filament the follicle refills within 30 days. The various portions of sebaceous follicles (acro- and infrainfundibulum) and the follicular contents are presented at the light microscopial and ultrastructural level. Follicles containing sebaceous filaments have a conspicuous granular layer and no acanthosis. Sebaceous filaments should be differentiated from a microcomedo and trichostasis spinolosa. They are a common morphological variant of sebaceous follicles.
皮脂丝是黄白色的圆柱形小管，可通过挤压皮肤或采用氰基丙烯酸酯技术从面部富含皮脂腺毛囊的区域挤出。皮脂丝最常见于青春期后面部毛孔粗大且患有脂溢性皮炎的个体的面部中央区域和鼻翼。皮脂丝由10 - 30层角质细胞构成的骨架组成，其中包裹着细菌、皮脂脂质、角质形成细胞碎片和一根毛发。挤出皮脂丝后，毛囊会在30天内重新充满。在光学显微镜和超微结构水平展示了皮脂腺毛囊的各个部分（漏斗上部和下部）以及毛囊内容物。含有皮脂丝的毛囊有明显的颗粒层且无棘层肥厚。皮脂丝应与微粉刺和毛发苔藓相鉴别。它们是皮脂腺毛囊常见的形态学变异。
