Xanthomas are lesions on the skin containing cholesterol and fats. They are often associated with inherited disorders of lipid metabolism (inherited problems with the way that fats are broken down and used).
Update Date 5/5/2016
Updated by: Michael A. Chen, MD, PhD, Associate Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.