What Is Thermage FLX? How Radiofrequency Firms Skin

Thermage FLX is a non-surgical skin-tightening treatment that uses monopolar radiofrequency (RF) energy to heat the deeper layers of the skin. The heat causes existing collagen to contract and prompts the skin to build new collagen over the following months. Most people choose it for mild to moderate skin laxity, a softer jawline or crepey skin around the eyes, and they usually return to normal activities the same day.

How Thermage FLX works

Radiofrequency is a form of electrical energy. Unlike lasers, which work through light and mainly affect the surface, RF passes through the skin and is converted into heat in the dermis and the fibrous layers beneath it.

• Immediate contraction: collagen fibres tighten when they reach the target temperature, which is why some people notice a subtle lift right after treatment.
• Collagen remodelling: the controlled heat triggers a healing response, and fibroblasts lay down new collagen over two to six months.
• Surface protection: the treatment tip cools the skin before, during and after each pulse, and a gentle vibration helps reduce discomfort.

The FLX system also includes AccuREP technology, which measures the skin before each pulse and adjusts the energy. This helps the treatment stay consistent across areas with different thickness.

What Thermage FLX can treat

Thermage is designed for laxity and texture rather than volume loss. Common treatment areas include:

• Face and jawline: mild jowling, loose skin along the lower face and a blurred jaw contour.
• Eyes: a dedicated eye tip can be used on the upper and lower eyelids for hooding and fine crepey lines.
• Neck: early neck laxity and horizontal lines.
• Body: the abdomen, arms, thighs and knees, using a larger body tip.

Who is a good candidate?

The best candidates are adults with early to moderate skin laxity who want gradual, natural-looking change without surgery or downtime. Many people start in their mid-30s to 50s, when collagen production slows noticeably.

Thermage is usually not the right choice if you have significant sagging that needs surgical lifting, a pacemaker or other implanted electronic device, active skin infection in the area, or if you are pregnant. Always share your full medical history, including previous fillers, threads and lifting treatments, so your doctor can plan safely.

What to expect on the day

1. Consultation: the doctor assesses your skin, marks a treatment grid and agrees the number of shots (for example 600 or 900 for the face).
2. Preparation: the skin is cleansed. A topical numbing cream may be applied, depending on the clinic and the area.
3. Treatment: the tip is moved across the grid in passes. Each pulse feels like a brief deep warmth followed by cooling. A full face typically takes 40 to 90 minutes.
4. After treatment: mild redness or warmth usually settles within a few hours, and most people return to work or sightseeing the same day.

Results timeline

• Right after: some people see a subtle tightening from collagen contraction.
• 1 to 3 months: gradual firming as new collagen forms.
• Up to 6 months: results continue to develop and are usually assessed at this point.
• Duration: results commonly last around 12 to 18 months, depending on age, skin quality and lifestyle. Many people repeat the treatment once a year.

Side effects and safety

Thermage FLX is considered low-risk when performed by a trained medical professional with a genuine device and tip. Temporary redness, swelling, tenderness or small bumps can occur and normally resolve within days. Rare risks include burns, blistering or changes in skin texture, which is why energy settings and technique matter.

Before booking, ask whether a doctor performs or supervises the treatment, and ask to see the sealed tip being opened. A genuine tip records its shot count, so this also confirms you receive the number of shots you paid for.

Aftercare tips

• Keep the skin hydrated and use a gentle moisturiser.
• Apply sunscreen with SPF 50+ every day.
• Avoid saunas, hot baths, intense exercise and alcohol for 1 to 2 days.
• Skip harsh exfoliants and retinoids for a few days if the skin feels sensitive.

Frequently asked questions

Does Thermage FLX hurt?

Most people describe brief pulses of deep heat. Cooling, vibration and adjustable energy levels keep it tolerable, and numbing cream can be used.

How many shots do I need?

A full face commonly uses 600 to 900 shots. The right number depends on the areas treated, skin thickness and your goals.

Can Thermage be combined with other treatments?

Yes. It is often paired with focused ultrasound lifting, skin boosters or fillers. Your doctor will plan the order and spacing so each treatment works as intended.

Is Thermage the same as Ultherapy?

No. Thermage uses radiofrequency to heat a broad layer of skin, while Ultherapy uses focused ultrasound to reach specific depths, including the SMAS layer. They are often compared and sometimes combined.

This article is for general information and does not replace a consultation with a qualified doctor. Suitability, results and recovery vary between individuals.