Does pityriasis rosea Koebnerise?

Abstract

The Koebner phenomenon or isomorphic phenomenon is described in dermatology texts as the production of lesions of the original disease, in clinically uninvolved skin, following trauma. The lesions are located at the site of trauma and evidence of a traumatic causation is the linear arrangement of some of the lesions, such as in the case of lichen planus. Other disorders known to exhibit the Koebner phenomenon include psoriasis and vitiligo. A number of other diseases are associated with the Koebner phenomenon. Pathergy is a phenomenon of pustule production following trauma, which occurs in certain disorders such as Pyoderma gangrenosum and Behçet's disease. In some disorders such as impetigo and verruca vulgaris, inoculation may give the appearance of the Koebner phenomenon. A case of pityriasis rosea and Koebner phenomenon at the site of routine blood assay is described in this work. This author has not thus far encountered any description of the Koebner reaction in relation to pityriasis rosea in the literature, but, perhaps, with this report, other physicians will be more open to this possibility and actually uncover similar cases.

Uncommon Presentation of Pityriasis Rosea After Yellow Fever Inoculation

“…1 In addition to these known associations, a literature review revealed a few isolated cases of Poland syndrome with various congenital dermatologic findings, including recessive X-linked ichthyosis, congenital hemangioma, and caféau-lait spots. [2][3][4] To our knowledge, our case is the first reported case of Poland syndrome associated with multiple CMN.…”

“…In this variant, commonly referred to as pityriasis circinata et marginata of Vidal or limb-girdle PR, the eruption generally appears in the axillae, the groin, or both, with the trunk and extremities usually spared. 4,5 A simple classification for atypical pityriasis rosea has been proposed by Chuh and Zawar (Box). 6 In our patient, the eruption fulfills all 3 essential clinical features (discrete annular lesions, scaling, and peripheral collarette scaling with central clearance on at least 2 lesions), all 3 optional clinical features (relative truncal distribution, orientation along skin cleavage lines, and herald patch), and none of the exclusional clinical features.…”

Pityriasis lichenoides chronica: – the role of infectious agents?

“…It often leaves a hyper-or hypo-pigmented macule [2,3]. The entire course of an eruption can take several years and, very often, lesions may be present in all stages of development [4]. Pityriasis lichenoides chronica usually occurs on the trunk and proximal parts of the extremities, but acral and segmental distributions have also been described, the lesions being usually asymptomatic.…”

Dermatology Eponyms – sign –Lexicon (K)

“…The appearance of isomorphic lesions at the site of an injury in lichen planus, warts, molluscum contagiosum (Fig. 13), psoriasis, or lichen nitidus along a site of injury [23][24][25][26][27].…”