Addison's Disease:

A disease characterized by hypotension, weight loss, anorexia, weakness, and sometimes a bronze-like melanotic hyperpigmentation of the skin. It is due to tuberculosis- or autoimmune-induced disease (hypofunction) of the adrenal glands that results in deficiency of aldosterone and cortisol. In the absence of replacement therapy, it is usually fatal. 

A condition of under-secretion of the adrenal cortex that may be accompanied with melanin pigmentation of the skin and mucous membranes.