The Jawline and Marionette Lines: Understanding PDRN's Mechanism for Lower Face Support

📅 May 2, 2026 👤 Restorative and Medical Skincare Researcher Simon Finch ⏱ 14 min read

The Jawline and Marionette Lines: Understanding PDRN's Mechanism for Lower Face Support

It happens somewhere between 55 and 65. You notice that your jawline isn't as sharp as it used to be. The skin along your mandible has a softer, less defined edge. And those lines extending downward from the corners of your mouth — the marionette lines — are becoming grooves that no concealer can fill. You start dressing in higher necklines, wondering when your jawline disappeared.

Lower face aging is not the same as upper face aging. The mechanisms are different, the structural changes are different, and — critically — the treatments need to be different. PDRN has a role in lower face rejuvenation, but understanding what it can and cannot do requires a clear picture of what's actually happening.

The Anatomy of Lower Face Aging

The lower face is a multi-layered structure, and each layer ages through a distinct mechanism.

Layer 1: The Mandibular Bone

The jawbone undergoes measurable resorption after menopause. The mandible loses width and height, particularly in the parasymphyseal region (near the chin) and the angle of the jaw. This bone loss reduces the structural foundation that supports the overlying soft tissues. When the frame shrinks, the soft tissues have less surface to adhere to — resulting in soft tissue "excess" that manifests as jowls.¹

Layer 2: The Fat Compartments

The lower face contains distinct fat compartments that behave independently with age:

• Malar fat pad: Descends downward and forward, dragging the midface skin with it. This descent creates a "step" between the cheek and the nasolabial fold — and eventually pulls tissue toward the jawline.
• Buccal fat pad: Atrophies and descends. Loss of buccal fat volume in the hollow of the cheek contributes to the gaunt, skeletonized appearance that makes the jawline look more prominent and the jowls more pronounced.
• Submental fat: Accumulates under the chin, blurring the cervicomental angle and contributing to the "double chin" appearance.
• Submandibular fat: Descends over the jawline, creating visible fat pads along the mandibular border that are diagnosed as jowls.

Layer 3: The Musculo-Aponeurotic System (SMAS)

Below the skin and fat, the SMAS layer — a connective tissue network — loses its tensile strength with age. The SMAS was designed to hold the fat compartments in place. When it weakens, the fat compartments are free to migrate downward. This is why SMAS-based facelifts (rather than skin-only lifts) are the gold standard for lower face rejuvenation.

Layer 4: The Skin

The skin along the mandible and around the mouth thins, loses collagen, and loses elastic recoil. But the skin is the last layer to change — it's responding to the changes in the layers beneath it.

Marionette Lines: What They Actually Are

Marionette lines — the grooves running from the corners of the mouth downward toward the chin — are not "wrinkles" in the traditional sense. They are a junction point where several age-related changes converge:

• A depression line: The skin lateral to the chin drops down while the chin tissue stays relatively stable, creating a groove at the transition point. This is similar to how a nasolabial fold forms.
• Fat compartment boundary: The marionette line corresponds to the boundary between the submental fat (which accumulates) and the mandibular fat (which descends). The line deepens as these fat compartments move in opposite directions.
• Muscular insertion: The depressor anguli oris muscle inserts into the skin at the corner of the mouth. Chronic contraction of this muscle creates a deepening fold over decades.

This is why marionette lines are so resistant to treatment. They're not skin lines — they're an anatomical convergence of bone loss, fat movement, and muscle activity.

Where PDRN Fits in Lower Face Rejuvenation

Understanding the multi-layer nature of lower face aging is crucial for setting realistic expectations about PDRN. Here's what the evidence says:

1. Dermal Thickening Along the Mandible

The skin over the mandible and along the jawline can be effectively thickened with PDRN treatment. Clinical studies show that 4–6 sessions of PDRN microneedling or injection increase dermal thickness by 15–25% in this area.² Thicker skin provides better coverage of the underlying structures, reducing the "sharp" appearance of jowling.

2. Collagen and Elastin Improvement for Marionette Lines

The perioral skin around marionette lines benefits from PDRN's dual effect: increased collagen I production (structural support) and elastin production (recoil). While this cannot completely erase a deep marionette line, it can soften the line's depth and improve the surrounding skin quality.³

3. Skin Quality Improvement for the "Jowl Shadow"

Jowls are visually emphasized by the shadow they cast. Thicker, more hydrated skin with better blood flow has a subtle lifting effect on the jowl area because the skin itself is healthier and more reflective. This is a visual effect rather than a true lift, but it can meaningfully improve the appearance of the lower face.⁴

4. Supporting Recovery After Other Procedures

PDRN is increasingly used as a pre-treatment and post-treatment adjunct to more invasive lower face procedures. A course of PDRN before filler for marionette lines or before a mini-facelift can improve the tissue quality, potentially improving outcomes and reducing recovery time.⁵

The Lower Face PDRN Protocol

Delivery Method

PDRN for the lower face is typically delivered via intradermal microinjections along the mandibular line and into the marionette grooves. Some practitioners combine PDRN with microneedling for broader coverage of the jowl area. The lower face requires larger volumes than the upper face — typically 2–4 mL depending on the treatment area.

Treatment Course

4–6 sessions at 2-week intervals. Improvement in skin quality along the jawline is visible after 3–4 sessions. Marionette line softening is more gradual — the collagen remodeling continues for 8–12 weeks after the final session.⁶

Combination Approaches

For meaningful lower face improvement, PDRN is best combined with other modalities:

• PDRN + HA filler: PDRN improves the tissue quality, filler restores volume along the mandible and in marionette lines. The combination produces better and longer-lasting results than either alone.
• PDRN + radiofrequency microneedling: RF provides thermal tightening of the SMAS and dermis, while PDRN adds regenerative support. This is a popular non-surgical combination for early to moderate jowling.
• PDRN + PLLA (Sculptra): PLLA provides gradual collagen stimulation over months, while PDRN provides more immediate dermal quality improvement. The two biostimulators work through different mechanisms and are complementary.

What PDRN Cannot Do for the Lower Face

This is the most important section of this article. The lower face limitations of PDRN are significant:

• Cannot lift descended fat pads: PDRN has no effect on the malar, buccal, or submandibular fat pads that have descended. Fat pad repositioning requires SMAS-based facelift surgery.
• Cannot restore mandibular bone: Bone resorption is permanent without surgical augmentation (chin implant, mandibular rim implants, or bone grafting).
• Cannot tighten the SMAS: The musculo-aponeurotic layer is beyond the reach of topical or injectable PDRN. SMAS tightening requires energy-based devices (Ultherapy, thread lifts) or surgery.
• Cannot eliminate deep marionette lines: Lines that are deep at rest — visible grooves rather than fine lines — require either filler, fat transfer, or resurfacing as primary treatment, with PDRN as support.
• Cannot reduce submental fat: The "double chin" requires mechanical removal (liposuction, Kybella, cool-sculpting).

The Bottom Line

Lower face aging — the jawline, jowls, and marionette lines — is primarily a structural problem. Bone resorption, fat pad descent, and SMAS laxity create the visible changes that skin creams cannot touch. PDRN addresses the skin layer effectively, improving dermal thickness, collagen quality, and skin resilience. But it cannot replace bone, lift fat, or tighten fascia.

For the woman who wants her jawline back, think in layers: PDRN for the skin, energy devices or threads for the SMAS, filler or fat for volume restoration, and — for significant changes — surgical consultation. PDRN is a powerful tool for lower face rejuvenation, but it works best as part of a comprehensive strategy that addresses all four layers of aging.