Which term describes the yellowish discoloration of the skin from tissue breakdown, commonly seen in neoplasm?

The term that accurately describes the yellowish discoloration of the skin due to tissue breakdown, particularly associated with neoplasms, is xanthosis. Xanthosis refers to an abnormal yellow pigmentation of the skin that may be linked to various medical conditions, including certain types of cancers, and occurs when the tissues release substances that can lead to this discoloration.

Jaundice is characterized by a yellowing of the skin and eyes, primarily due to an accumulation of bilirubin in the bloodstream, which is often related to liver dysfunction, rather than tissue breakdown from neoplasms. Cyanosis involves a bluish or purplish hue of the skin, indicating a lack of oxygen in the blood, and is not related to yellow discoloration. Chloasma, commonly known as "mask of pregnancy," refers to brownish patches on the face due to hormonal changes and is distinctly different from the yellow coloration described in this question. Thus, xanthosis directly corresponds to the yellowish skin discoloration associated specifically with neoplastic tissue breakdown.