Acquired perforating dermatoses (APDs) are a group of diverse skin disorders in patients with systemic disease, most commonly chronic renal failure and diabetes mellitus. APD induced by medication has seldom been reported. Anti-PD-1 monoclonal antibody has recently been used as a broad-spectrum, effective, durable, and relatively safe antitumor therapy for various malignancies. Thus far, known side effects involving skin have included rash, pruritus, and vitiligo. Here, we present a rare case of a unilateral linear eruption with histopathologic features of APD in a 36-year-old man during treatment with Terepril monoclonal antibody. To the best of our knowledge, APD induced by the PD-1 inhibitor has not been described in the medical literature.
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