Double Chin Even Though I'm Very Slim?

This is all too common. The good news is you are the perfect candidate for treatment. In my hands below are the best options, though there are many!
Option 1 : liposuction/sculpting. This is done in clinic under local with maybe some medication to make you feel calm. 1-2wks of post op swelling and brusing. 
Pros: quick results, minimal down time. 
Cons: a procedure, small scar at lipo cannula site

Option 2: Kybella injection: done in clinic, no real acute downtime though patients often describe a very "full sensation" with a heavy neck for up to 2 wks.
Pros: done in clinic, minimal down time
Cons: multiple treatments often required, results takes a few months to expose themselves 

I always discuss fat transfer along with liposuction. It can help sculpt the surrounding areas. Not a must but a very nice adjunct.
Good luck.
DrC

Submental fullness is a very common complaint and concern. There are many options available on the market today from coolsculpt, kybella and other noninvasive. This can also be addressed more fully with liposuction, using a small incision under the chin. Liposuction is my preferred approach as it can be done under local anesthesia in the office. Recovery is some swelling and bruising for 1-2 weeks. Kybella and coolscupt also cause swelling for 1-2 weeks and often require multiple treatments. Sometimes a chin implant is also essential to improve the jaw line and facial contours. Have a consultation with a specialist that has all of the tools to offer you.  If you just see an injector you'll only learn about kybella.

Yes, submental fat under the chin can be the result of many factors besides weight gain and genetics is at the top of the list. The good news is that there are treatment options for this issue that are appropriate at any age. CoolSculpting is a noninvasive procedure that uses controlled cooling to freeze fat cells. Since fat freezes at a higher temperature than other cells of the body, the fat is destroyed while surrounding skin and tissue remains untouched. Results take time to develop as the body naturally flushes away the treated cells. However, the final outcome will be long-lasting, up to 15 years in a recent study published by our group.

If you have a significant amount of submental fat, liposuction is another option. I perform tumescent liposuction using micro-cannulas, which provide superior precision and results while shortening recovery for most patients. The procedure can be performed using local anesthesia and recovery is typically just a few days. This procedure offers more dramatic improvement after a single treatment session and results are also long-lasting as long as you maintain your stable weight. I would schedule a consultation with a board-certified dermatologist with extensive experience in facial contouring procedures for a full assessment and treatment recommendations.

There are many people that have a double chin, even though they are thin. A double chin could be a genetic thing. liposuction or liposculpture can fix a double chin, and the recovery is very easy!

A double chin can commonly be a genetic trait, especially if you're thin.  Sometimes, it is accompanied by a small chin as well.  Treatment of a double chin can be performed with Coolsculpting, Kybella, or neck liposuction.  Coolsculpting is most popular because it's a nonsurgical option, has little downtime, and gives good results.  Neck liposuction is the most definitive and treats the entire double chin area.  It has about a weeks worth of bruising and swelling but really no pain but because of the downtime, people often opt for coolsculpting.  Kybella is performed less and less because it's a nonsurgical solution but has as much swelling as neck liposuction in many cases.  

I could better answer your question if there were pictures provided. However, there are several options to treat submental (chin) fat. Since you are young, your skin is likely to be of good quality which makes you a good candidate for Kybella and liposuction. If you have loose or thin skin, then these options may not be the best fit.Kybella is a simple in office treatment that involves injections of an acid that dissolves the fat cells in your chin area. I suggest doing 3-4 treatments 6 weeks apart for optimal results. The downtime associated with kybella is having little-moderate swelling of the chin area for 1-2 weeks. Liposuction involves a short amount of time spent in the OR, and the results are more dramatic and obtained quicker than doing a series of Kybella injections. There is a 2 week down time of limited activity levels, and minimal swelling in the area for 4-6 weeks. In good heath,Dr. Ellen Mahony. 

Without photos, it's impossible to determine the feasibility of neck liposuction for genetic, exercise-resistant fat. We are not fans of Kybella, and do not offer this treatment in our practice. Thank you! Dr Joseph

I find that VASER liposuction in combination with ThermiRF are best for contouring the chin in those who are candidates, but Kybella can be used as an alternative and needs to be combined with thermage/ultherapy/exilis or coolsculpting for good results. I recommend getting a formal evaluation with a facial sculpting expert. Best, Dr. Emer

There are a number of options to address the appearance of a double chin.  In order to decide the best way to approach it for you, make sure you consult with a fellowship trained board certified facial plastic surgeon or plastic surgeon.  The right treatment depends on your anatomy. 
In young, healthy, thin patients with just a small amount of excess fat beneath the chin, Kybella - an injectable that dissolves fat can be a good option.  You should be prepared to undergo at least 2 treatments separated about 6 weeks apart.  After the injection, expect some swelling and soreness in the chin and neck area for a few days.  There can be tingling and numbness in the area for longer than that. 
In patients who have more than just a little excess submental fat, submental liposuction may be more suitable than Kybella. 
In patients who not only have excess fat but also a weak chin, a chin implant may help improve the overall profile appearance as well. 
Finally in older patients who may have more excess skin and fat, I would avoid Kybella or liposuction and opt for a lower facelift instead.  

People do not have to be overweight to have excess fatty tissue underneath the chin, giving the appearance of a double chin. You are correct in assuming that this is sometimes related to genetics. There are both surgical and non-surgical options for treatment of double chin specifically due to excess fatty tissue. 
Submental (under the chin) liposuction is a great, quick, minimally-invasive surgical procedure that involves making a small, < 1 cm incision under the chin and using a liposuction device to remove this fatty tissue. This procedure can be done with local anesthesia alone, or sometimes with some medication taken by mouth to relax you, but does not typically require general anesthesia. You may have some swelling and/or bruising for the first week or two after the procedure, but downtime is minimal and results are immediate and permanent. 
One great non-surgical option is the injection of Kybella, which causes the fatty tissue to dissolve. This does not require any incisions, but most patients require 2-3 treatments spaced out at least 4-6 weeks between treatments, so it takes a little longer to see results. Some patients report mild swelling or tightness for a few days after injection, but otherwise there is essentially no down-time.
Sometimes the appearance of a double chin may not be related to excess fatty tissue. I recommend seeking evaluation with a plastic surgeon with expertise in facial aesthetics who can determine the exact cause of your concerns and recommend the most appropriate treatment for you.
Best wishes,

There are a few options. Submental liposuction creates the best results for tightening and defining the jaw line. (laser lipo is preferred for the effect)Kybella is an in office treatment that involves tiny injections in the fatty areas under the chin and reaches maximum results in about 8 weeks. 0 down time. It is a quick and easy procedure that just involves some minimal to moderate swelling in the injected area. Please feel free to visit our website or contact our office at any time. Best Regards,