Acquired reactive perforating collagenosis in association with pulmonary papillary adenocarcinoma

Reactive perforating collagenosis is one of the perforating dermatoses; the acquired form is characterized by transepithelial elimination of altered collagen bundles. It has been seen in association 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 reactive perforating collagenosis in association with pulmonary papillary adenocarcinoma, and our study is the first to report it.