XERF (Zaerf)

What is XERF (Zaerf)?

XERF (Zaerf) is a non-invasive skin rejuvenation and tightening treatment utilizing high-frequency (radiofrequency/RF) energy. By concentrating RF energy into the deep dermal layer and subcutaneous tissue within the skin, thermal energy is generated in the target area. This thermal stimulus causes existing collagen fibers to contract immediately, while also activating fibroblasts to promote the production of new collagen and elastin. A key feature is that it can be used safely regardless of phototype.

Mechanism of Action: High-frequency thermal energy and dermal remodeling

RF energy is converted to heat by electrical resistance within skin tissue. When dermal temperature reaches 55–65°C, a portion of the collagen triple helix structure denatures and contracts, providing immediate tightening effects. Simultaneously, this 'controlled thermal damage' triggers the wound-healing cascade, initiating new synthesis of Type I and Type III collagen and elastin from fibroblasts. A combined therapy trial of microneedle RF, fractional RF, and multi-source non-invasive tightening published in the Journal of Cosmetic and Laser Therapy (2016) demonstrates that leveraging this mechanism achieves full-face rejuvenation with minimal downtime (doi:10.1080/14764172.2016.1228981).

Expected results

The primary skin concerns for which XERF is indicated are as follows:

Improvement of Sagging (skin laxity), nasolabial folds, and marionette lines

Reduction of fine lines and expression lines, and improved skin texture

Diminished appearance of enlarged pores and skin dullness

Lift and tightening of the entire face and jawline

Improvement of acne scars and crater-like indentations (scarring)

Treatment procedure

After confirming skin condition and treatment goals during consultation, cleansing and makeup removal are performed. A numbing cream is applied as needed and you wait 20–30 minutes. During treatment, a specialized handpiece is applied to the entire face using a gliding or stamping technique. Treatment time varies depending on the irradiation mode and target area, but typically takes 30–60 minutes for the full face. Post-treatment care focuses on moisturizing and sun protection.

Downtime and post-treatment course

In the hours to one day immediately following treatment, a sensation of warmth or mild redness may occur, but this typically subsides by the next day. Makeup application is possible from the next day onward. The risk of swelling or bruising is low, and most patients can resume normal daily life without disruption by the next day. Since new collagen production takes approximately 3–6 months, results gradually become apparent over 1–3 months following treatment. Duration of results varies by individual depending on lifestyle and sun exposure, but typically lasts 6–12 months. Maintenance treatments every 3–6 months may be recommended for optimal sustained results.

Evidence: Acne scar improvement with microneedle RF

A study of 31 patients published in the Journal of Cutaneous and Aesthetic Surgery (2014, doi:10.4103/0974-2077.138328) showed that after four sessions of fractional RF treatment performed at 6-week intervals, 80.64% of patients with Grade 3–4 acne scars experienced improvement of two grades or more. Adverse effects were limited to temporary pain, erythema, and edema, demonstrating high safety. The RF energy heating mechanism employed by XERF builds upon this clinical foundation.