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A xanthoma (pl. xanthomas or xanthomata) (condition: xanthomatosis), from Greek xanthos, Î¾Î±Î½Î¸Î¿Ï, yellow, is a deposition of yellowish cholesterol-rich material that can appear anywhere in the body in various disease states. xanthelasma is a sharply demarcated yellowish collection of cholesterol underneath the skin, usually on or around the eyelids. Strictly, a xanthelasma is a distinct condition, only being called a xanthoma when becoming larger and nodular, assuming tumorous proportions.
planar xanthoma, plane xanthoma, xanthoma plaÂ´num a form manifested as soft yellowish, tannish, or dark red flat macules or slightly elevated plaques, sometimes having a central white area, which may be localized or generalized, often occurring in association with other xanthomas and certain hyperlipoproteinemias. papule, nodule or plaque in the skin due to lipid deposits; the color of a xanthoma is usually yellow, but may be brown, reddish, or cream. Microscopically, the lesions show light cells with foamy protoplasm (foam cells, xanthoma cells). They occur most commonly in White Leghorn chickens and rarely in other species.