Double chin even when skinny: possible reasons

Under-chin fullness may be inherited and stable across your adult life. A smaller lower jaw or chin can make the soft tissue beneath it project forward visually. Ageing and sun exposure can reduce skin elasticity, while weight changes can leave extra skin even after the rest of the body becomes leaner. Posture also matters: bending the neck or holding the head forward creates a fold that may look different when you stand naturally. A clinician can distinguish these contributors by examining the contour while you sit, stand, and turn your head.

Avoid trying to lose more weight solely to change a local chin contour; that may not address inherited fat or skin. Take consistent front and side photographs in neutral posture if you want to track change. A consultation can identify whether a fat-focused option, skin-focused approach, or no procedure is reasonable. Selected fatty tissue may be treated with [Fat Dissolving Injections](/treatments/injectables/fat-dissolving-injection/) or [Cryolipolysis](/treatments/laser-and-energy/cryolipolysis/), depending on the assessment. Ask how chin shape and loose skin affect the expected appearance.

Seek medical advice if fullness appears suddenly, grows on one side, feels hard or fixed, becomes painful, or comes with fever or illness. Difficulty swallowing, a changed voice, breathing difficulty, or swelling of the lips and tongue needs prompt or urgent care. A stable soft fold is often a cosmetic concern, but a new neck lump should not be assumed to be fat.

Ask whether the profile is mainly shaped by fat, skin, chin projection, or posture. Which change is realistic without making the jawline look hollow? What alternatives exist if the skin does not tighten, and how will you assess symmetry before and after treatment?