A 79-year-old woman presented with a 3-month history of rapid growth of multiple long, thin, non-pigmented hairs, distributed diffusely over the entire body, preferentially on the face and trunk (Figure, A). After extensive investigations, two neoplasms were detected — a breast mucinous carcinoma and a metastatic endometrial carcinoma (Figure, B) — establishing the diagnosis of paraneoplastic hypertrichosis lanuginosa acquisita.