Bladder
Having acne in the part leading to the head and forehead means an abnormality in your bladder because of excessive intake of dairy products.
Colon
If your forehead is rough and not shiny, it means you have a problem with the function of your large intestine. Excessive intake of proteins, fats, sugar, etc. is the main cause, so diarrhea or depression can occur.
Liver
If you feel pain and easily tired in your eyes, or you have deep wrinkles over your eyebrows, it means that your liver is swollen or hardening due to eating a lot of oily food.
Kidney
If the underside of the eye is swollen or the black smell is suddenly formed, it means that your kidneys have deteriorated.