Reactive perforating collagenosis is one of the perforatingdermatoses; the acquired form is characterized by transepithelialelimination of altered collagen bundles. It has been seen inassociation with multiple disorders including diabetes mellitus,renal failure, hyperparathyroidism, liver disease, neurodermatitis,IgA nephropathy, and periampullary carcinoma with jaundice.According to the literature, there is no report of reactiveperforating collagenosis in association with pulmonary papillaryadenocarcinoma, and our study is the first to report it.