01587nas a2200217   4500000000100000008004100001260003400042653002400076653005700100653002100157653001700178653003000195653001200225653003100237100001200268700001300280700001200293245006000305520097900365022002501344       2023                            d  bOxford University Press (OUP)10aInfectious Diseases10aPublic Health, Environmental and Occupational Health10aGeneral Medicine10aParasitology10aErythema Nodosum Leprosum10aLeprosy10areverse Koebner phenomenon1 aSingh S1 aNarang T1 aDogra S00aReverse Koebner phenomenon in erythema nodosum leprosum3 a<p><strong>Background:</strong> Erythema nodosum leprosum (ENL) is an immunologically mediated phenomenon complicating the course of leprosy. Reverse Koebner phenomenon is the term used to describe the sparing of previously injured or diseased skin by new skin lesions of the disease.</p>

<p><strong>Methods:</strong> A middle-aged woman with a known case of lepromatous leprosy for the past year presented with an eruption of reddish painful nodules over her body. The lesions were found to characteristically spare the sites of previous scars.</p>

<p><strong>Results:</strong> This sparing phenomenon of previous scar sites has been termed reverse Koebner phenomenon, a site of the body that offers greater resistance than the rest of the body to the onset of the disease, seen in various diseases, but it has never been described in ENL.</p>

<p><strong>Conclusion:</strong> This sparing of scar sites in ENL can be attributed to reverse Koebner phenomenon.</p>
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