Tubular yellowishperifollicular scalingin folliculitisdecalvans. In folliculitis decalvans, as in lichen planopilaris, scales form tubular structures around the hair shaft (blue arrows). However, two differences compared with lichen planopilaris may be observed. First, scales tend to have a yellowish tint due to the purulent content. Second, the tubular structures are not firmly attached to the hair shaft. They unfold from the hair at the distal end and form a collar-like surface, as seen here. Another characteristic feature of folliculitis decalvans in this image is epidermal hyperplasia arranged in a starburst pattern (marked with a blue ring). Diffuse, homogenous scaling is also visible in this image (white arrow) (dry trichoscopy; ×20)
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