Hi well I read something in a book about a skinny person and black skin (but not the statements below it mentioned the connection between the two).
If this person is underweight perhaps benefit may occur with a normal weight.
Also efforts to increase circulation with brisk walking, water and foods containing the B vitamins such as niacin might be useful. I am not sure the factory made vitamins are that great according to a couple sources I read about.
Some of these foods might be spelt, asparagus, peanuts (no hydrogenations or additives), green peas, winter squash, summer squash, collard greens, carrots, broccoli, spinach, fresh raspberries, canteloupe, rice bran, green vegetables, sunflower seed, whole wheat products(without additives),Wheat germ, and green snap string beans. Romaine lettuce, red tomato, boiled eggplant, fennel, turnip greens, boiled chard, cauliflower, and Kale may have a bit less but might still be useful.
These foods may also increase the temperature of the skin. Is the skin on the ears cooler?
Are there any other symptoms?