This is a rash that was once a hallmark sign of Graves' disease, a type of hyperthyroidism. Thanks to earlier diagnoses and treatment of thyroid diseases, this rash is now considered a rare symptom.

Thyroid diseases are characterized by hyperfunction (hyperthyroidism), hypofunction (hypothyoidism) or inflammation (thyroiditis) of the thyroid gland or the presence of thyroid nodules, which can ...