There are two main types of wrinkles: lines caused by our habitual facial expressions (which are called expression wrinkles) and lines associated with the loss of collagen, fat, and elasticity from the skin due to aging or other types of damage (known as static wrinkles). Static wrinkles remain etched into the face even when the face is at rest. Fillers are typically gels injected beneath the skin to add volume and make wrinkles less noticeable. Because they’re so well researched and commonly applied, there are few side effects to watch for. Filler migration is one.

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