A Rare Clown Nose Manifestation of Metastatic Eccrine Porocarcinoma: Case Study and Review of the Literature.

The "clown nose" is a rare clinical presentation characterized by reddish-brown nodular lesions localized to the nasal tip. This distinctive sign has been associated with metastatic malignancies, genetic syndromes, and primary dermatologic conditions. We describe a rare case of metastatic eccrine porocarcinoma manifesting as a clown nose in a 54-year-old man with a history of metastatic lung squamous cell carcinoma. In addition, we performed a systematic literature review through PubMed to evaluate infiltration of the nose as a potential indicator of underlying tumor metastasis.