When do skin abnormalities occur in association with nutritional disturbances?

Skin manifestations occur when structural or enzymatic processes are affected by a deficiency or excess of a particular nutrient. This can be seen with dietary insufficiency or excess, malabsorption, drug interference, catabolic states, and metabolic, renal, hepatic, and inherited disorders. Nutrients include protein, carbohydrate, fat, vitamins, minerals, and trace elements.

Heath ML, Sidbury R: Cutaneous manifestations of nutritional deficiency, Curr Opin Pediatr 18:417–422, 2006.