Perforating dermatoses, an often overlooked entity comprised of Kyrle's disease, perforating folliculitis, reactive perforating collagenosis, elastosis perforans serpiginosa, and acquired perforating dermatosis, are succinctly described, focusing attention on their clinical features, histopathology, treatment, and pathogenesis. The literature on these facets has been extensively reviewed. In addition, three fresh cases of Kyrle's and one of perforating folliculitis have been incorporated to illustrate these conditions.
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