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The accumulation of submental fat, better known as a "double chin," is one of the most common concerns, producing the famous "double chin."

A double chin can be caused by excess fat, sagging skin, or both.

When the defining characteristic is excess fat, it is related to excess weight, and measures in this regard should be introduced before treating the double chin itself.

When a double chin is caused by sagging skin, it's a result of facial aging, where there's a reduction in collagen and elastin, and a descent of tissues.

However, it is very common for a double chin to be caused by both reasons: excess fat and sagging skin, resulting in a "double chin." In this case, the excess fat weighs down the skin, which becomes more fragile and sagging, making the "double chin" more pronounced.

For early stages, lifestyle changes, massages, and other measures can be a solution for a double chin. However, in more advanced cases, plastic surgery may be necessary.