Department of Dermatology, Central Clinical Hospital, Ministry of the Interior, Warsaw, Poland.
Clin Exp Dermatol. 2012 Aug;37(6):615-9. doi: 10.1111/j.1365-2230.2012.04401.x. Epub 2012 Jun 8.
'Black dots' are macrocomedo-like round structures localized to the follicular ostium, and are considered a specific trichoscopic feature of alopecia areata (AA).
To characterize specific features of 'black dots', and assess their possible presence in common hair and scalp disorders.
In total, 107 patients with hair loss [30 with alopecia areata (AA), 37 with androgenetic alopecia (AGA), 17 with chronic telogen effluvium (TE), 23 with other hair and scalp diseases] and 93 healthy controls were examined, using a videodermoscope with 20-70 times magnification.
There was a correlation between the black dots and the early acute phase of the various alopecia types with the presence of the black dots. Black dots were found in 11% (22/107) of patients with hair loss, including 53.3% (16/30) with AA; in 40% (2/5) of patients with severe chemotherapy-induced alopecia, and in 100% of patients with dissecting cellulitis of the scalp (n = 2), hypotrichosis simplex (n = 1), and congenital aplasia cutis (n = 1). No black dots were seen in patients with AGA or TE.
Black dots are not specific for AA, and may be present in other hair and scalp diseases.
“黑点”是位于毛囊口的类似大粉刺的圆形结构，被认为是斑秃（AA）的一种特定毛发镜特征。
描述“黑点”的特征，并评估其在常见毛发和头皮疾病中的可能存在。
共检查了 107 例脱发患者[30 例斑秃（AA）、37 例雄激素性脱发（AGA）、17 例慢性休止期脱发（TE）、23 例其他毛发和头皮疾病]和 93 例健康对照者，使用放大倍数为 20-70 倍的视频皮肤镜。
黑点与各种脱发类型的早期急性阶段之间存在相关性，存在黑点。脱发患者中有 11%（22/107）出现黑点，其中 53.3%（16/30）为 AA；在 40%（2/5）因化疗引起严重脱发的患者中，以及在 100%的头皮分离性蜂窝织炎（n=2）、单纯性毛发稀少症（n=1）和先天性皮肤发育不全（n=1）患者中都存在黑点。AGA 或 TE 患者中未见黑点。
黑点不是 AA 的特异性表现，可能存在于其他毛发和头皮疾病中。
