I have these grooves under my eyes/mid cheek. I am unsure of what they are. I thought they might be malar bags/mounds? (Photos)

It is most effective managed with the use of hyaluronic acid fillers.  It is a normal variation that is often associated with a lean athletic body.

thanks for your question. They are mid cheek grooves. There is a ligament that tethers the skin to underlying bone. Fillers will help for sure but often they don't go away completely   

thanks for the question.  What you have can be seen in many patients.  These folds are representative of skin attachments via ligaments to the deep tissues below the eyelids.  This common finding is the good news.  The bad news is that this abnormality is not always easy to improve.  Mid cheek lifts, mid facelifts and fillers could be considered.  Please realize that many  physicians can offer these options to you, but also be aware that you may be disappointed after the effort has been attempted and a compromised result is noted.Good luck to you.  Choose a very qualified Plastic Surgeon and listen carefully to the consultation, both the promises and the limitations.Frank Rieger M.D.  Tampa Board Certified Plastic Surgeon