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How do thyroid hormone levels affect the skin?

Dr. Ellen Marmur, MD
Dermatology
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.
Simple Skin Beauty: Every Woman's Guide to a Lifetime of Healthy, Gorgeous Skin

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Simple Skin Beauty: Every Woman's Guide to a Lifetime of Healthy, Gorgeous Skin

What if a leading dermatologist just happened to be your best friend and you could ask her anything? DR. ELLEN MARMUR, a world-renowned New York City dermatologist, answers all your questions with...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.