Low thyroid function (hypothyroidism) can lead to dry or mottled skin but also cause a life-threatening coma called myxedema. Hyperthyroidism (an overactive thyroid) can lead to nail changes ...

Mottled skin is a bluish-red, lacy or net-like appearance you see underneath the skin. Also called livedo reticularis, it is often harmless. Some people have mottled skin after cold exposure, or ...