Quick answer: Ultherapy side effects are usually mild and short-lived. Most people have some redness, swelling and tenderness for a few days, especially along the jaw. Less common effects include bruising, tingling and temporary nerve irritation that can cause numbness or slight weakness for a few weeks. Serious, lasting problems are rare in experienced hands.
Key takeaways
- Redness, mild swelling and tenderness are the most common side effects.
- Tenderness along the jawline can last one to a few weeks.
- Bruising, welts and tingling are less common and temporary.
- Temporary nerve irritation is rare and usually resolves within weeks.
- Live ultrasound imaging and correct depth selection lower the risk.
What is Ultherapy?
Ultherapy is a micro-focused ultrasound treatment made by Merz Aesthetics. It places small points of heat at set depths, including the SMAS layer that supports the face, to stimulate new collagen and lift the skin gradually. A key feature is live ultrasound imaging, which lets the doctor see the skin layers before delivering energy. Ultherapy has FDA clearance to lift the brow, the skin under the chin and the neck, and to improve lines on the chest.
What are the common side effects?
- Redness: often fades within a few hours.
- Mild swelling: can last a few days, sometimes up to a week.
- Tenderness: the treated area, especially the jawline, may feel sore when touched for a few days to a few weeks.
- Tingling or a tight feeling: usually settles within days.
These effects are part of the normal healing response as the heated points repair and collagen begins to form. Most visitors return to normal activities the same day.
What are the less common side effects?
- Bruising: small bruises can appear and fade within one to two weeks.
- Welts or lines: faint raised lines on the skin can appear briefly and usually fade within days.
- Temporary numbness: small areas may feel numb for a short time.
- Muscle weakness: rarely, slight weakness around the mouth may occur for a few weeks.
What are the nerve risks?
Some facial nerves run close to the treated layers, especially around the jaw and mouth. If energy is delivered close to a nerve, it can cause temporary irritation. This may feel like numbness, tingling or slight weakness, for example an uneven smile. In almost all reported cases, these effects resolve on their own within a few weeks as the nerve recovers. Experienced doctors reduce this risk by avoiding known nerve areas, using live imaging and choosing suitable depths.
Can Ultherapy cause burns?
Burns are rare. They are more likely if the transducer does not touch the skin properly or if energy is placed too close to the surface. Live imaging helps confirm good contact and correct depth. Genuine transducers and proper settings also matter.
What about fat loss?
Some people worry that Ultherapy may cause fat loss. When energy is delivered at the correct depth, the aim is to tighten the support layer, not to reduce fat. Very thin faces need careful planning, and your doctor may adjust depths or avoid certain areas. This is one reason a face assessment before treatment is important.
How to lower your risk
- Choose a clinic where a doctor assesses your face and performs or supervises the treatment.
- Ask whether genuine Ultherapy transducers are used.
- Tell your doctor about recent fillers, threads, implants or medical conditions.
- Follow aftercare advice, such as avoiding saunas and strong pressure for a short time.
- Report unusual pain, numbness or weakness so your doctor can check it.
Who should avoid or delay Ultherapy?
People with open wounds or active skin infections in the treatment area, those who are pregnant, and some people with certain implants or medical conditions may need to delay or avoid treatment. Your doctor will review your health history during consultation.
How common are side effects?
Korea treated about 2.01 million foreign patients in 2025, and around 63% came for dermatology, according to the Ministry of Health and Welfare. Ultherapy is one of the most popular lifting treatments, and most people have only mild, temporary effects. Knowing what is normal helps you feel more comfortable during recovery.
Frequently asked questions
How long does tenderness last after Ultherapy?
Usually a few days, though some people feel mild tenderness along the jaw for a few weeks.
Is numbness after Ultherapy permanent?
No. Temporary numbness usually resolves within weeks.
Can I wear makeup after Ultherapy?
Yes. Most people can wear makeup the same day or the next day.
Should I contact my doctor about side effects?
Yes, if you notice severe pain, blistering, or weakness that does not improve.
Sources
- Ministry of Health and Welfare, Republic of Korea – 2025 foreign patient statistics (press release, 2026).
- U.S. Food and Drug Administration – 510(k) premarket notification database (Ulthera System).
- Merz Aesthetics – Ultherapy important safety information.
This article is for general information only and is not medical advice. Results vary between individuals. Please consult a qualified physician before any treatment.
