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Choosing the right lip filler treatment requires an understanding of anatomy, product types, and long-term maintenance. At Cheng Plastic Surgery and Medspa—serving Saratoga and Redwood City—we specialize in a "conservative-first" approach to ensure balanced, natural results.

What is Lip Filler?

Lip fillers are injectable gels composed of Hyaluronic Acid (HA). HA is a naturally occurring, hydrophilic molecule that attracts and binds water within the tissue. When injected by a medical professional, it provides:

  • Increased volume and "plumpness."
  • Reduction of fine lines and wrinkles on the lip surface.
  • Improved structural definition of the vermillion border.

Best Dermal Fillers for Lips: Juvederm vs. Restylane

For over 15 years, Juvederm and Restylane have remained the FDA-approved gold standards for lip augmentation. These are the primary fillers used at Cheng Plastic Surgery, voted Silicon Valley’s best medspa.

Identifying the Need: When to Consider Treatment

Lip filler is a highly customized procedure. Patients typically seek treatment to address:

  • Asymmetry: Disproportion between the upper and lower lips.
  • Age-Related Volume Loss: Restoring fullness lost to the natural aging process.
  • Facial Imbalance: Adjusting lip proportions to better complement the nose, chin, and cheeks.

How to Prevent "Filler Migration"

Filler migration occurs when the gel moves away from the intended injection site, often creating an unnatural "shelf" above the lip. This is usually the result of overfilling or ignoring the patient's natural anatomy.

To avoid migration, our experts recommend:

  1. Micro-injections: Injecting small amounts incrementally rather than large boluses.
  2. Anatomical Respect: Working within the natural boundaries of the lip tissue.
  3. Patience: Avoiding the "filler blindness" that leads to over-requesting product. A responsible provider will prioritize long-term tissue health over immediate, excessive volume.

Achieving a Natural Look: The "Start Small" Strategy

  • Standard Volume: One full syringe is typically used for a noticeable "full lip."
  • Subtle Enhancement: We recommend starting with 1/4 to 1/2 of a syringe for first-time patients.
  • The Two-Week Rule: If additional volume is desired, a touch-up can be performed after two weeks once the initial swelling has subsided.

Safety and Side Effects

Common, temporary side effects include mild swelling, bruising, and tenderness at the injection site. Lumps or firm spots are common during the first 14 days and typically resolve as the Hyaluronic Acid integrates with the natural lip tissue.


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