The sudden appearance of dark spots on your skin may indicate adrenal insufficiency (Addison’s disease), though this is not always the case. Other symptoms include muscle/joint pain, loss of appetite, low blood pressure, and low blood sugar levels. If you notice these symptoms, contact your doctor promptly.
Rashes are commonly understood to indicate underlying issues. Whether caused by food, medication, or contagious diseases like chickenpox, persistent and severe rashes should prompt a visit to the doctor.
Conditions such as Stevens-Johnson Syndrome or Lyell’s syndrome can have serious consequences. Immediate medical attention is necessary if an adult develops chickenpox.