Picture of Addison's Disease
Addison's disease can affect the skin and cause hyperpigmentation. Pictured is the hand of a person suffering from Addison's associated hyperpigmentation alongside the hand of a person who does not have the condition, but who comes from a similar ethnic background. An accident or illness can worsen the skin hyperpigmentation of Addison's disease.
Text Reference: "Addison's Disease." Contemporary Clinical Dentistry.