What physical examination finding is commonly associated with Addison's disease?

Bronzed skin pigmentation is a characteristic finding associated with Addison's disease, which is a form of adrenal insufficiency. This occurs due to a deficiency in the production of cortisol and aldosterone by the adrenal glands. The lack of cortisol leads to an increase in the secretion of adrenocorticotropic hormone (ACTH) from the pituitary gland because of reduced feedback inhibition. Elevated levels of ACTH can stimulate melanocytes, resulting in increased melanin production and the distinct bronzed or hyperpigmented appearance of the skin.

In Addison's disease, this pigmentation can be particularly noticeable in areas of sun exposure, pressure points, and scars, contributing to the recognition of the condition. Therefore, bronzed skin pigmentation is a key clinical sign that healthcare providers look for during examination, differentiating it from other potential conditions.