{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T21:55:47Z","timestamp":1790286947820,"version":"4.1.0"},"reference-count":20,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2019,10,20]],"date-time":"2019-10-20T00:00:00Z","timestamp":1571529600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Cutan Pathol"],"published-print":{"date-parts":[[2020,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Pembrolizumab, an anti\u2010programmed cell death\u20101 (PD\u20101) antibody preparation, has been shown to induce various dermatologic adverse events which may present with delayed onset or even after discontinuation of therapy. We report a 78\u2010year\u2010old female patient with a stage II lung adenocarcinoma treated with pembrolizumab, who developed lichenoid eruptions and multiple cutaneous plaque\/nodular eruptions as pseudoepitheliomatous hyperplasia, during and up to 2\u2009months after discontinuation of pembrolizumab therapy. Multiple skin biopsies revealed epidermal hyperplasia with hyperkeratosis, hypergranulosis, diffuse to patchy lichenoid lymphocyte infiltrate with scattered eosinophils and neutrophils, confluent to scant dyskeratosis of the lower epidermis, minimal to overt invagination, and cystic proliferation of squamous epithelium to papillomatosis with hypergranulosis and keratosis. Overall, multiple patterns were present with similarities to lichenoid drug eruption, lichen planus, early invasive squamous cell carcinoma, early keratoacanthoma, and verruca. However, the findings ultimately supported a diagnosis of hypertrophic lichen planus. All the lesions resolved with oral prednisone, hydroxychloroquine, and topical triamcinolone acetonide ointment 0.1%. In summary, our case shows that pembrolizumab can induce lichenoid eruption with pseudoepitheliomatous hyperplasia, and these lesions can clinically and pathologically mimic early invasive squamous cell carcinomas or keratoacanthomas.<\/jats:p>","DOI":"10.1111\/cup.13587","type":"journal-article","created":{"date-parts":[[2019,10,7]],"date-time":"2019-10-07T16:49:33Z","timestamp":1570466973000},"page":"275-279","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Pembrolizumab\u2010induced pseudoepitheliomatous eruption consistent with hypertrophic lichen planus"],"prefix":"10.1111","volume":"47","author":[{"given":"Aimee","family":"Coscarart","sequence":"first","affiliation":[{"name":"Department of Pathology and Dermatology Tulane University  New Orleans Louisiana"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5854-9459","authenticated-orcid":false,"given":"Julianna","family":"Martel","sequence":"additional","affiliation":[{"name":"Department of Pathology and Dermatology Tulane University  New Orleans Louisiana"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael P.","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Pathology and Dermatology Tulane University  New Orleans Louisiana"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alun R.","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Pathology and Dermatology Tulane University  New Orleans 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