Dark spots
If you noticed dark spots which pop up on your skin all of a sudden, this could be a symptom of adrenal insufficiency or Addison’s disease. Your adrenal glands do not generate enough steroid hormones and people with such disease (Addison’s) can feel pain in the muscles and joints and lose their appetite.
White patches
Another signal of a health problem is white patches that start to appear on your skin. In this case, your skin loses pigmentation, and this disease is called vitiligo. It develops when cells called melanocytes are killed by the body’s immune system, causing the area of skin to turn white, because the cells no longer make pigment.