Do I have a double chin? I am a pretty active, average weight 20 year old woman. (Photo)

Double chin is secondary to excess of fat in the neck under the chin and under the jaw line.
Chin liposuction is the plastic surgery procedure that removes the excess of skin of the neck thus correcting the double chin. Also when performed along the jaw line it helps to achieve a very sharp jaw line. In female patients chin liposuction when performed also along the jaw line helps to achieve a very chiseled sharp and more attractive feminine facial look. In my practice I often perform chin liposuction wide awake under local anesthesia as an outpatient at my office operating room. 

Hello and thank-you for sharing your question and photo.
Correction of a double chin can be achieved either though a surgical or non-invasive approaches. Liposuction and Jplazty (cold plasma energy to tighten skin) of the chin and neck produces consistently good results for appropriate candidates.  We are very excited with the development of several non-invasive techniques for correction of a double chin. Ultherapy of the lower face and  submental neck can provide both skin tightening and fat reduction for more definition.  We also offer the Cool mini as a non-surgical alternative to liposuction for the right candidate. Generally, two treatments are required separated by 4-6 weeks.  We also offer Kybella which is another non-surgical alternative to liposuction. Generally 3-6 treatments are needed separated by 4-6 weeks.   
I would discuss your goals and expectations with your surgeon. 
Good Luck!

You appear to have some fat under the jawline. Neck liposuction is a great option for patients with good skin elasticity and excess fat in the neck and around the jawline. Liposuction is effective at removing this excess fat and stimulating the skin to contract over time to create improved angulation and definition along the jawline. I recommend seeing an expert for a consultation. I hope this helps!

Thank you for your photos. You can correct a double chin thru a variety of treatments including Kybella injections, SculpSure and Chin liposuction. For more information, I recommend getting a in person consultation with a board-certified dermatologist. 

Everyone has the potential for a double chin depending on the position of one's chin and how the head is being held.  If the small amount of fat underneath the chin is bothersome to you, you could benefit from chin liposuction or a small chin implant.  A chin implant will allow the skin under the chin to be elevated and therefore decreases the appearance of a double chin.  A combination of Chin liposuction and a small chin implant could greatly improve the appearance of a double chin by removing the fat and elevating the skin.  

Hello dearThanks for the question and provided information as well.  Based on your photo you are a good candidate for chin liposuction, Chin liposuction may be an option, it makes you look younger and more attractive with a sharp jawline , and better facial proportions.I recommend you to make an appointment with a board certified plastic surgeon for a good evaluation and to talk about your goals.Good luck :)

 No, you do not have a double chin. There's only a very small amount of fat present which can be removed with simple liposuction, but the benefit would be minimal.

 Hi, I have performed many facial shaping procedures, including Chin Augmentation with dermal fillers or silastic chin implants, for over 30 years.  From the photo, your chin is quite weak while there is a very slight excess of fat under the chin.  When the chin is weak, this creates an imbalance making the nose appear larger, the mid face top heavy, the lower face looks short, de-emphasizes the lips and allows early formation of a "double chin".  
 Proper placement of a silastic chin implant adds forward projection to the chin thereby creating harmony and balance to the lower face.  Using the same incision, liposuction can be performed to reduce the fat and further shape the neck.  Excess skin, from below the chin, can also be removed through the same incision.  
 I have found that placement of a silastic chin implant, through a small curved incision under the chin (also allows excess skin removal) to be very safe, quick, highly effective and far less invasive than a sliding genioplasty (requires extensive tissue dissection, bone cuts and placement of metal screws and plates to secure the cut segments of bone).  I perform chin implant surgery in 30 minutes or less, often using a local anesthetic alone.  In my opinion, you are a good candidate for chin implant surgery.  In contrast, removal of the excess fat alone, by any method, will not correct the weak chin.  
Hope this helps.