Under-eye puffiness — whether in the form of mild swelling, dark "bags" or saggy under-eye skin can have many possible causes. A few possible diagnoses include:
* Heredity
* Fluid retention (from the weather or hormone levels)
* Allergies or dermatitis (redness and itching are usually also present)
* Certain medications
If his puffiness is severe and persistent or if you notice swelling (called an "edema") in other parts of his body, see a doctor. You want to rule out other possible causes of swelling, such as kidney or thyroid problems or a side effect of medications.