Acne Treatment

Microneedle RF (Radiofrequency)

Microneedling RF combines microneedles penetrating the skin with radiofrequency energy emitted from the needle tips, delivering dual stimulation into the deep dermis with minimal epidermal damage. It offers a faster recovery than CO2 lasers and carries a lower risk of hyperpigmentation — ideal for deep atrophic scars, thick skin, darker skin tones, and enlarged pores; typically requiring 3–4 sessions spaced 4–6 weeks apart.

Medically reviewed by BS.Ths.CKI Kim Kha — BonBoz Clinic

Mechanism of Action

Sterile microneedles penetrate the skin at preset depths (0.5–3.5 mm) and deliver radiofrequency (RF) energy directly from their tips, creating controlled fractional heating within the dermis. This thermal energy immediately contracts existing collagen fibers and triggers neocollagenesis and neoelastogenesis over the next 1–3 months; simultaneously, the microneedles create mechanical micro-channels similar to traditional microneedling. Because the RF energy is delivered beneath the surface, the epidermis remains virtually intact with minimal ablation.

How does it differ from traditional microneedling and fractional CO2 laser?

Traditional microneedling only creates superficial mechanical micro-injuries. RF microneedling adds deep thermal coagulation, delivering significantly stronger remodeling for deep scars and skin laxity. Fractional CO2 laser works from the surface downward—highly effective for uneven skin texture, but it ablates the epidermis and carries a higher risk of post-inflammatory hyperpigmentation (PIH). In contrast, RF microneedling works from the inside out while sparing the epidermal surface, making it safer for darker skin types and ideal for patients requiring minimal downtime. Many clinical cases benefit from combining both modalities in a structured protocol.

Who is it suitable for?

Moderate-to-deep boxcar and rolling scars, thick skin; enlarged pores; mild skin laxity along the cheeks and jawline; acne scars on darker skin tones; and patients needing quick recovery times. Less suitable for: very deep ice-pick scars (which typically require TCA CROSS), excessively thin skin, and patients with implanted electronic devices.

Treatment Course & Results

Typically 3–4 sessions spaced 4–6 weeks apart. Mild erythema usually subsides within 1–2 days, followed by faint micro-crusting that flakes off within 3–5 days. Visible improvements generally emerge after the 2nd session and continue to progress for up to 3 months following the final treatment. The degree of improvement varies based on scar depth and individual healing response.

At BonBoz Clinic

A dermatologist performs a detailed skin analysis, tailoring the needle penetration depth and RF energy levels for each specific facial zone (adjusting between thicker areas like the cheeks and thinner areas like the temples). The procedure is performed under topical anesthesia and can be combined with PRP or restorative active serums when clinically indicated. A dermatologist directly performs the treatment and conducts a follow-up assessment before each subsequent session.

How is it performed?

Topical numbing cream is applied for 30–45 minutes. The doctor customizes the needle depth and RF energy levels for each specific area, systematically stamping the tip across the targeted zone in a grid pattern — taking 20–40 minutes for the full face; a mild prickling and warm sensation is to be expected. The procedure is followed by cooling, the application of recovery active serums or PRP, and sunscreen.

Before the procedure

Discontinue topical retinoids for 5–7 days; avoid exfoliating and sun exposure for 1 week prior; inform your doctor of any anticoagulants, implanted electronic devices (pacemakers), history of keloids, or herpes; arrive with clean, makeup-free skin.

After the procedure

Redness and mild swelling for 1–2 days; micro-crusts will dry and naturally peel off after 3–5 days — do not pick or scratch; use a gentle cleanser, apply restorative moisturizer, and wear broad-spectrum SPF 50 sunscreen; avoid makeup for 24–48 hours; avoid saunas and strenuous exercise for 3 days. Follow-up appointment in 4–6 weeks.

Possible risks — your doctor explains them before treatment

  • Mild redness and swelling for 1–3 days; pinpoint bruising is rare
  • Post-inflammatory hyperpigmentation (PIH) — lower risk than CO2 laser, but still possible, especially without proper sun protection
  • Temporary grid-like micro-crusting on the skin
  • Infection due to improper aftercare; herpes reactivation in patients with a prior history
  • Rare: grid scarring or subcutaneous fat loss if energy levels are set too high — requires proper parameter setting by a doctor

Who should NOT have this?

  • Having a pacemaker or implanted electronic devices
  • Active inflammatory acne, dermatitis, or herpes infection in the treatment area
  • Currently pregnant or breastfeeding
  • Predisposition to severe keloid scarring
  • Expecting complete scar removal after a single session
  • Very thin or atrophic skin in the treatment area (RF may cause further thinning)
Chân dung BS.Ths.CKI Kim Kha

BS.Ths.CKI Kim Kha

Aesthetic Dermatology

  • Graduated as a General Practitioner — Tay Nguyen University (2018)
  • Specialist Level I in Dermatology — Pham Ngoc Thach University of Medicine, degree awarded in 2025
  • Medical Practicing Certificate No. 009784/ĐL-CCHN — Issued by the Department of Health of Dak Lak Province on 15/10/2021
  • Over 8 years of experience in aesthetic dermatology practice (since 2018), including over 4 years of practice with an official Medical Practicing Certificate
  • Primary Specialization in Plastic and Reconstructive Surgery; Certificates in Dermatological Procedures & Minor Surgery, Microsurgery, and Lasers & Light Therapies in Dermatology
  • Certificates in Dermal Fillers, Botox, and Thread Lifts; Certificates in Emergency Resuscitation and Infection Control
  • Formerly practiced at the Aesthetic Dermatology Unit — Post and Telecommunications General Hospital (2019–2021) and Venus Sunrise Clinic (2022–2024) before joining BonBoz Clinic (2025)
  • Former lecturer in Aesthetic Dermatology Theory at Ana Aesthetic Training School (2018–2019)
  • Over 5,000 clinical dermatology cases treated
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Frequently asked questions

Is RF microneedling painful?

With topical numbing cream, you will mostly feel a prickling and warm sensation, which is tolerable; the forehead and jawline are more sensitive.

How long is the recovery time?

Redness lasts 1–2 days, and micro-crusts will shed in 3–5 days; many clients return to work the next day with slightly pink skin.

Which is better, RF microneedling or CO2 laser?

It depends on your scar type and skin condition: CO2 is potent for uneven surface texture; RF microneedling is suitable for deep scars, thicker skin, darker skin tones, and those needing quick recovery. The doctor will choose the right option or combine both.

How many sessions are needed?

Typically 3–4 sessions spaced 4–6 weeks apart; mild skin laxity requires 2–3 sessions. Results continue to improve for 3 months after the final session.

Does it thin the skin?

On the contrary, it stimulates collagen production to make the skin thicker and firmer. Only excessively high energy carries the risk of subcutaneous fat loss — which is why it must be performed by a doctor.

Does it cause hyperpigmentation?

The risk is lower than with CO2 laser due to minimal surface damage, but strict sun protection is still required.

Does RF microneedling treat enlarged pores?

Yes, it is one of the best indications as it tightens the follicular walls and reduces sebum production.

Is combining with PRP necessary?

It is not mandatory; PRP aids recovery and may enhance the response in some individuals. The doctor will recommend it based on individual skin conditions.

How long does it take to see scar improvement?

Changes become gradually noticeable after the 2nd session, about 6–8 weeks from the first session, as collagen remodeling takes time.

Who performs the treatment at BonBoz?

A Dermatology specialist sets the parameters and directly performs the procedure.
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