How do thyroid hormone levels affect the skin?

Low thyroid hormone (hypothyroidism) causes fish scale–like thickening of the skin that's rough and dry (myxedema). The skin on the hands and feet can turn yellow, the hair on the eyebrows can fall out, other hair becomes coarse, and brittle, and the nails break easily. Hyperthyroidism, caused by too much thyroid hormone, creates the opposite reaction in the skin: it may become moist and smooth, with a tendency to flush and get red.

Some people with hyperthyroidism get a bronzed appearance to the skin (melanoderma) and even melasma on the cheeks.

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