RF Treatment Depth: A Heating Map from Epidermis to Fascia
A Heating Map of Skin Layers
| Layer | Depth (approx.) | Reaching configurations | Goals addressed |
|---|---|---|---|
| Epidermis | 0-0.1 mm | Protected by cooling in all | Texture (indirect) |
| Superficial dermis | 0.1-0.7 mm | Bipolar, high-frequency monopolar | Fine lines, pores, photoaging |
| Deep dermis | 0.7-2 mm | Microneedle (1.5-2 mm), monopolar | Laxity, scars |
| Fibrous septa / superficial fat | 2-6 mm | Monopolar, vacuum+multipolar | Contours, cellulite appearance |
| Superficial fascia (SMAS level) | 3-4.5 mm (cheek) | Focused ultrasound chiefly; some monopolar | Lifting |
Layer Determines Indication Fit
- Fine lines and pores are superficial-dermal — bipolar and non-ablative fractional excel.
- Acne scars span full dermis — need fractional microneedle or ablative depth.
- Lower-face laxity involves dermis + septa + fascia — monopolar, focused ultrasound or combinations.
- Cellulite appearance stems from septal traction — vacuum+multipolar at superficial septa.
How One Platform Changes Depth
Depth is not fixed by configuration alone: needle insertion steps (0.5-3.5 mm), vacuum strength (pulling tissue closer), pressure (compressing fat) and cooling strategy all move the energy peak within one platform — the basis of flexible, indication-driven configurations.
FAQ
Is cheek depth the same as forehead?
No. Forehead skin is thin over bone; microneedle depth is usually capped around 1.5 mm, while cheeks tolerate 2-3.5 mm. Good protocols ship region-specific depth templates.
Is deeper heating always better?
No. Energy beyond the target layer only adds pain and risk; efficacy comes from heating the right layer within the temperature window.