A double chin forms when under-chin fat, skin laxity, jaw structure, posture and puffiness overlap in varying proportions. Here’s how to get a rough read at home on whether yours is fat or sagging, and how the approach differs depending on the cause.
Hi, this is DAYONE Clinic. Plenty of people are bothered by a fold under the chin in photos, or by fullness beneath the jaw whenever they look down. It’s commonly called a double chin, but more than one thing can create that shape.
It might be fat that has built up under the chin. It might be the skin and the fascia beneath it losing firmness and starting to sag. Often it’s both, and jaw structure or everyday posture can play a part too. Two double chins can look alike yet have different causes—and a different cause can call for a different approach. So before deciding what to do, the first step is figuring out which type yours is closer to.
What does a fat-related double chin look like?
When under-chin fat is the cause, you can usually feel a soft, thick pad beneath the skin. If you gently pinch the skin under your chin, it feels plump between your fingers—and the thicker that pinch, the larger the share of fat is likely to be. This type tends to stand out more after weight gain, and even from the front, the jawline may look rounded, continuing downward in a soft curve.
That said, you can have under-chin fat even with a slim build. Facial fat doesn’t always increase and decrease in step with body weight, so some people are lean everywhere else but still have fullness under the chin. It’s worth remembering that a double chin doesn’t always track with your weight.
What does a sagging-related double chin look like?
When sagging is the cause, what you notice first is looseness rather than thickness. Typical signs are thin, lax skin below the jawline that creases, or a blurred border where the jaw meets the neck. When you pinch the skin, you tend to get a thin layer that stretches rather than a thick pad.
As we age, skin elasticity and the structures that support the face gradually weaken, so even the same amount of fat can look as if it has slid lower. That’s why, among people who feel a double chin appeared seemingly overnight, quite a few are actually seeing the start of sagging rather than added fat. If that sounds familiar, notice in the mirror whether sagging around the mouth and cheeks bothers you too, not just the jawline.
Is there a simple way to check at home?
An accurate assessment requires an in-person exam, where a doctor can see and feel the area, but you can get a rough sense of which way things lean at home. The easiest method: stand comfortably, look straight ahead, and lightly pinch the skin under your chin between your thumb and index finger. Compare whether it feels thick and full or thin and stretchy.
Another method is to watch how things change with your head angle. If the fold under your chin mostly disappears when you tilt your head up slightly, sagging or posture may be playing a bigger role. If the fullness under your chin stays put even with your head raised, fat may make up a larger share. Taking a photo of your profile helps too, since the angle between the jaw and neck—hard to judge from the front—shows up clearly from the side.
Keep in mind that these checks are only a rough guide. Fat and sagging are often mixed, so it’s hard to pin it down to one or the other on your own.
Are there other causes besides fat and sagging?
Sometimes other factors contribute to what looks like a double chin.
Jaw structure—if your chin is small or recessed, the border between the jaw and neck can look undefined, creating the appearance of a double chin even without much fat there.
Posture—if you tend to crane your head forward while looking at your phone or computer for long stretches, the skin under your chin folds and the area looks more prominent.
Puffiness and swelling—if the area under your chin looks puffy after a late dinner, a short night’s sleep or salty food, it may be a temporary change.
With so many possible causes, two people with similar-looking double chins may need very different solutions.
How does the approach change depending on the cause?
When fat makes up most of it, you might consider an approach aimed at reducing under-chin fat. Fat-dissolving injections targeted to a small area are one example, and the number of sessions and the spacing between them can vary with the area and the amount of fat.
When sagging makes up most of it, you might consider a lifting treatment that addresses both the loss of firmness and the laxity. Here, too, the right option depends on how much sagging there is, where it is and how thick your skin is.
When fat and sagging are both present, which one you address first matters. If you reduce only the fat but your skin lacks firmness, you may be left with loose skin. If you only tighten the sagging but there’s a lot of fat, the area may not look as neat as you’d hoped. That’s why it’s hard to say any one method works for every double chin.
The bottom line
A double chin is the result of fat, sagging, jaw structure, posture and puffiness overlapping in varying proportions. Pinching the skin or changing your head angle at home can give you a rough sense of the trend, but an accurate assessment requires an in-person exam where the area can be seen and felt. Sorting out the cause first can cut down on trial and error and make it clearer what you actually need. If the area under your chin has bothered you for a while, it’s worth consulting a specialist to have your current condition evaluated.
This article is general information about the treatment and does not replace an individual diagnosis or treatment plan. Results and their duration vary from person to person.
Wondering what would suit you?
Whether a treatment suits you, and how to plan it, is best decided with a doctor.