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You could be having allergy to certain food which can explain dark circles
around eyes and the stool described is typical of fat malabsorption
. Do get your stool tested and also tests for malabsorption of certain kind of food. Certain types of disease can also cause this like cholestasis in gall bladder
or pancreatic disease
. Get a thorough checkup and stool test to rule out parasitic infection
. Get your blood sugar tested as well. Avoid those food that bring about this like spicy food, fatty food, sweet food. Eat more fresh fruits and green leafy vegetables. Drink plenty of water.