Density Lifting Results, Pain, and Side Effects: 2MHz and 6.78MHz RF vs Thermage

Monopolar RF passes current between the treatment electrode and a return pad, producing heat through tissue resistance. Research models suggest differences in heat distribution at 6.78MHz and 2MHz, but actual depth depends on skin and fat thickness, contact, tip, output, pulse, and cooling rather than frequency alone. The clinical evidence is growing, but large independent comparisons and long-term follow-up remain limited.

A recent prospective multicenter study reported improvements in lower-face laxity and satisfaction after dual-frequency monopolar RF. However, the study population, assessment methods, follow-up period, and conflicts of interest must be considered, and the findings cannot be directly interpreted as evidence of superiority over Thermage or other devices. Immediate changes may include swelling and tissue contraction, while stable changes are assessed over several weeks to several months.

Appropriate candidates are adults who want to manage mild loss of firmness without an incision and with a relatively short recovery. Electronic implants, metal in the treatment area, reduced sensation, infection, recent fillers, threads, or fat grafting, a very thin face or hollow cheeks, and pregnancy or breastfeeding require separate assessment. A history of fat atrophy or nerve injury in the treatment area must also be disclosed.

The doctor evaluates skin thickness, fat volume, hollows, the direction of laxity, and high-risk areas before planning the tip, mode, shot count, total energy, and overlap. Heat and momentary pain may occur during treatment, and redness, swelling, and tenderness generally last several hours to several days. The return-pad site and treatment area should also be monitored for blisters, persistent pain, and sensory changes.

In addition to erythema, swelling, and tenderness, possible complications include burns, blisters, crusting, pigmentation, persistent neuralgia or sensory changes, fat atrophy, and contour irregularity. Inadequate cooling, poor contact, and excessive overlap may increase risk. Sharp pain or localized overheating during treatment, or skin-color changes, blisters, or depressions afterward, requires immediate medical evaluation.

Q. Does 2MHz penetrate deeper?

A. Models suggest differences, but actual thermal depth cannot be determined by frequency alone.

Q. Are more shots always better?

A. Energy by area, overlap, contact, and facial structure are more important than shot count alone.

Q. Is it possible even if I have little facial fat?

A. A conservative plan may be needed to avoid areas at risk of hollowing.

A prospective multicenter clinical study of dual-frequency 6.78MHz and 2MHz monopolar RF (https://pubmed.ncbi.nlm.nih.gov/41930066/) and thermal-response models and tissue analyses by frequency (https://pubmed.ncbi.nlm.nih.gov/41315066/) were consulted. A histologic analysis of monopolar RF (https://pubmed.ncbi.nlm.nih.gov/32319176/) was also consulted and is not interpreted as direct evidence that one device is superior to another.

SEOLREIM Clinic does not recommend lifting treatment based only on a popular device name or shot count. The doctor personally diagnoses where fat should be preserved and the direction of laxity, then compares only 2–3 appropriate options among signature lifting treatments—such as Density, Thermage FLX, Ultherapy PRIME, and Oligio—using devices actually available at the clinic. The doctor performs the treatment directly according to SEOLREIM’s principles of authentic products, correct quantities, and attentive care.

Visitors searching for “Density Korea” or “Thermage Korea” should confirm the actual device, tip, mode, total energy, expected pain, and how to contact the clinic about burns or altered sensation after returning home. SEOLREIM Clinic is on the 11th floor of the Gangnam 8258 Building, about 1 minute from Exit 3 of Gangnam Station. Appointments can be made through the website’s KakaoTalk consultation, Naver booking, or telephone channels. International visitors comparing information on a Gangnam skin clinic, Seoul skin clinic, Gangnam Station skin clinic, or Korean skin clinic should prepare their passport, allergy information, medication list, recent treatment records, and departure schedule, and should confirm available consultation languages and the scope of interpretation support before booking. Depending on the examination findings, same-day treatment may not be possible, or follow-up after returning home may be necessary.

Written by: SEOLREIM Content Editor / Medical review: Completed / Review confirmation date: 2026-10-23 / Publication date: 2026-09-29 / Updated: 2026-10-27. This is general medical information and does not replace individual diagnosis or a treatment prescription.