Massage castor oil all over the body and soak in a warm bath to encourage the oil to be absorbed through the skin and thin the lymph. This technique aids detoxification and boosts the immune system by promoting an efficient lymphatic system. Specific attention should be paid to massaging oil into the inner thighs, underarms, and behind the knees where lymph nodes are close to the skin. A flax seed oil and water rub introduces essential fatty acids through the skin, especially for babies and children to ensure adequate omega-3 and omega-6 intake. It also benefits adults who have trouble digesting these oils orally.