Hollow Area Under Eyes (20 Years Old)

Under the eye hollows takes specific knowledge of both the cheek and  eye relationship.  In some patients, this prominence can result in a tired, less attractive look.  Possible solutions:

Loss of cheek volume-If the cause is from loss of cheek volume, a facial filler can be an excellent choice for rejuvenation.  Autologous fat is also a good choice.  

Pigmenation-In some cases it is due to dark pigmenation creating the appearance of a hollow.  Skin lightners can help to minimize this effect.

Blood vessel prominence-  Fine blood vessels can also cause the appearance of hollows

It sounds as if you may be describing a tear trough problem where it appears hollow around the bone between the eyes and nose. Often this area can be improved with either fat injections or temporary fillers like restylane or juvederm. I would suggest one of those first to make sure you like the effect and then other permanent options like fat or perhaps surgical transposition of fat can be considered. I hope this information helps.

I agree that fillers and volumizers will improve the appearance of your undereyes. You are young and an invasive surgery (such as a midface/cheek lift or fat repositioning) has scarring and risk. You should be able to get a very nice improvement with injectable fillers in these areas. Try this before undergoing an invasive surgery.....and this advice is from a surgeon!