Hyaluronic acid injections do not treat the bag, but can improve their appearance by lifting the prolapsed malar fat. This will give extra support to the orbicular muscle, and create the effect of a mini face lift.
A possible tear through is also reduced, which reduces the hollow near the bag.
There is really no way to avoid malar bags. It is necessary to have a healthy lifestyle: avoid cigarettes and alcohol, have a balanced diet low in salt, sleep a sufficient number of hours, have a regular sports activity.