Under-eye filler gone bad - Puffy eyes? (Photos)

my first question would be what filler was used and then how long you've waited since the injection and each subsequent treatment. The fullness can be due to post treatment swelling if it has only been a short while since the treatment of any followup intervention,  it can also be inadvertent injection into the incorrect area under the eye. I would apply warm compresses and take advils for 2-3 weeks if there  is no contraindication to it first, Consult with a Facial plastic surgeon about a corticosteroid trial. If the swelling has not subsided at that point, your options are to wait (the swelling will likely go away on its with time), or possibly (last option) surgical correction.

If it has been at least a month the puffiness that you are seeing may be due to rising in the morning. When you wake up most people's eyes are puffy or swollen, after a few hours the area lessons due to moving about. If you had a deficit in that area what you are noticing is the area is fuller due to filler and the puffiness you probably already had when you woke up, but didn't notice as much due to the deficit. I would leave the area alone, ice, no supplements (some cause swelling and bruising), no blood thinning medications such as advil, don't exercise, no hot showers, tubs or baths and wait a few weeks to see how the area is healing.