ABSTRACTA 1,1/2 year‐old neutered male cat was presented with a non pruritic skin disease. Pale plaque‐like lesions were present on the face, head, axillae and ventral abdomen. Hypercholesterolaemia, hypertriglyceridaemia, hyperglycaemia and glycosuria were all present and histopathological examination confirmed that the skin lesions were xanthomata. A lipoprotein profile revealed an increase in chylomicrons, very low density lipoproteins and low density lipoproteins, and low post heparin lipoprotein lipase activity was present. A diagnosis of diabetes mellitus was made and following treatment with insulin and a change to a low fat, low carbohydrate diet the cat had normal values for blood lipids and glucose and the skin lesions had resolved within a mo