It's time to give our bodies the same attention we give our faces when it comes to aging. Loose skin on the upper arms, loss of elasticity around the abdomen, and wrinkles above the knees are just some of the visible signs that time leaves on our bodies. But what if it were possible to achieve firmer, tighter-looking skin without surgery, simply by stimulating the skin's natural collagen production? With its latest advancements in body treatments, next-generation Ultherapy PRIME technology is opening a new chapter in aesthetic medicine.
When we think about aging, we tend to focus on facial wrinkles, loss of volume in the cheeks, or sagging along the jawline. Yet aging doesn't happen only on our faces. Over time, the skin on our upper arms can become loose, the abdomen may lose its firmness, and fine lines, wrinkles, and a crepey texture can appear around the knees. These changes are not exclusively associated with age. Pregnancy, weight fluctuations, menopause, and hormonal changes can also affect the skin's elasticity. At the heart of this process lies the gradual decline and structural deterioration of collagen and elastin, the two essential proteins responsible for the skin's strength, firmness, and elasticity.
Modern aesthetic medicine is no longer focused solely on correcting visible signs of aging at the skin's surface. Today, the emphasis is increasingly on stimulating the skin's natural regenerative mechanisms by targeting the deeper structural layers that provide support and firmness. Ultherapy PRIME, the next generation of the well-established Ultherapy technology used for facial and neck rejuvenation, now brings this approach to the body. With new applications targeting skin laxity on the arms, abdomen, and knees, it offers an exciting option for non-surgical body rejuvenation.
What Is Ultherapy PRIME and How Does It Work for Body Rejuvenation?
Ultherapy PRIME is a next-generation, non-invasive skin-tightening technology that uses microfocused ultrasound energy to stimulate the skin's natural production of collagen and elastin. One of its key advantages is its ability to deliver ultrasound energy precisely into different layers beneath the skin's surface, targeting the structural tissues responsible for firmness and support without disrupting the outer skin.
During treatment, microfocused ultrasound energy creates small, controlled thermal coagulation points at specific depths within the tissue. This thermal stimulation activates the body's natural repair response, encouraging the formation of new collagen and elastin. As the skin gradually rebuilds its structural support, improvements in firmness and the appearance of laxity may become visible over time. Rather than adding volume or artificially stretching the skin, the treatment works by supporting the skin's own regenerative capacity. This is why the results develop progressively as collagen remodeling takes place.
One of the most significant developments in Ultherapy PRIME is the expansion of microfocused ultrasound technology, traditionally associated with facial and neck rejuvenation, into body skin-tightening treatments. In November 2025, Merz Aesthetics announced that Ultherapy PRIME had received U.S. Food and Drug Administration (FDA) clearance for improving the appearance of skin laxity on the front and back of the upper arms and the abdomen. In August 2026, the technology's body treatment indications expanded further with FDA clearance for improving the appearance of skin laxity around the knees. These developments mark an important step toward a more comprehensive approach to rejuvenation, addressing visible signs of aging not only on the face but also on different areas of the body.
Another defining feature of Ultherapy PRIME is its real-time ultrasound imaging technology. This advanced visualization system allows physicians to see the tissue layers beneath the skin during treatment and deliver ultrasound energy at depths appropriate for each patient's anatomy. Because the thickness and structure of the skin and underlying tissues vary between the arms, abdomen, and knees, visualization plays an important role in personalizing treatment. Enhanced image quality, improved treatment efficiency, and advances designed to increase patient comfort are also among the features that distinguish Ultherapy PRIME from earlier-generation technology.
Which Areas of the Body Can Be Treated with Ultherapy PRIME?
The primary body treatment areas for Ultherapy PRIME include the upper arms, abdomen, and knees. These areas may develop mild to moderate skin laxity as a result of aging, collagen loss, weight fluctuations, and hormonal changes. Microfocused ultrasound technology can target the appearance of looseness and loss of firmness in these regions. However, because each area has different anatomical characteristics and aging patterns, treatment must be tailored to its specific needs.
Arms: Firmer, More Toned-Looking Skin
The upper arms are among the areas where age-related changes in skin elasticity can become particularly noticeable. Over time, the skin on the back of the upper arms may begin to loosen, while weight fluctuations and declining collagen production can make the appearance of sagging more pronounced. Although regular exercise can strengthen the underlying muscles, it cannot always restore the skin's lost elasticity. As a result, even physically active individuals with well-developed arm muscles may experience loose, finely wrinkled skin on their upper arms.
Ultherapy PRIME targets suitable areas on both the front and back of the upper arms, stimulating collagen and elastin production to help the skin appear firmer, smoother, and more toned. It may be particularly appealing to individuals experiencing mild to moderate laxity who want to improve the appearance of their upper arms without undergoing surgery. According to data shared by the manufacturer, results from a single treatment session in suitable patients may last six months or longer. However, Ultherapy PRIME does not replace surgical arm-lift procedures in individuals with significant excess skin.
Abdomen: Restoring the Appearance of Firmness After Pregnancy and Weight Changes
The abdomen is one of the areas most commonly affected by loss of skin elasticity following pregnancy, weight fluctuations, and aging. The skin around the navel and lower abdomen may gradually become looser, thinner, and more wrinkled. Even after successful weight loss, the skin does not always return to its previous level of firmness. Similarly, abdominal skin laxity following pregnancy may persist in some individuals.
Ultherapy PRIME aims to improve the appearance of mild to moderate skin laxity in the abdominal area. By stimulating collagen and elastin production through microfocused ultrasound energy, the treatment may help the abdominal skin appear progressively firmer, smoother, and more toned. It can be considered a non-surgical option for suitable individuals who experience changes in skin elasticity after pregnancy or weight fluctuations. However, an important distinction must be made: Ultherapy PRIME is not a fat-reduction or body-slimming treatment. Its primary purpose is to improve the appearance of skin firmness rather than reduce fat deposits. Significant excess skin, abdominal muscle separation, or structural problems involving the abdominal wall may require other treatment approaches.
Knees: A New Approach to an Often-Overlooked Sign of Aging
The knees are often overlooked when it comes to body rejuvenation, despite being an area where age-related skin changes can become increasingly visible. As collagen and elastin levels decline, fine lines, wrinkles, and loose skin may develop above and around the kneecaps. These changes can become particularly noticeable when the knees are bent or the legs are exposed. Even regular exercise and strengthening the leg muscles cannot necessarily correct the loss of elasticity in the skin above the knees.
Ultherapy PRIME's FDA clearance in August 2026 for improving the appearance of skin laxity around the knees represents another notable development in non-surgical body rejuvenation. By delivering microfocused ultrasound energy to appropriate tissue depths, the treatment stimulates collagen production and aims to improve the appearance of firmness and smoothness around the knees over time. It may be considered for individuals with mild to moderate skin laxity who are looking for a non-invasive approach. Because of the anatomical characteristics of the knee area, selecting the appropriate treatment depth and carefully planning energy delivery are especially important.
Who Is a Good Candidate for Ultherapy PRIME Body Treatments?
Ultherapy PRIME body treatments may be suitable for individuals who are beginning to notice mild to moderate skin laxity, prefer natural-looking improvements, and do not wish to undergo surgery. People experiencing age-related collagen loss, changes in skin elasticity after pregnancy, weight fluctuations, or menopause may be candidates for treatment, particularly when they notice reduced firmness on the upper arms, abdomen, or knees.
However, not all skin laxity is the same. In some individuals, the primary concern is declining collagen and elasticity, while in others, significant excess skin or structural changes may be the main issue. Since Ultherapy PRIME is not a surgical procedure designed to remove excess skin, appropriate patient selection is essential. Before treatment, the physician should evaluate skin quality, the degree of laxity, medical history, and individual aesthetic expectations to determine whether the procedure is suitable.
How Is an Ultherapy PRIME Body Treatment Performed?
An Ultherapy PRIME body treatment begins with a medical assessment of the area to be treated and the development of a personalized treatment plan. During the procedure, ultrasound gel is applied to the skin, and the treatment handpiece is placed over the targeted area. Real-time ultrasound imaging allows the physician to visualize the underlying tissue layers and deliver energy precisely to the selected depths. Ultherapy technology offers transducers designed to target tissue depths of 1.5 mm, 3.0 mm, and 4.5 mm. The appropriate transducer and treatment depth are determined according to the anatomy of the treatment area and the applicable protocol.
Patients may experience brief sensations of warmth, tingling, or discomfort beneath the skin as the ultrasound energy is delivered. Next-generation Ultherapy PRIME incorporates improvements designed to enhance patient comfort compared with earlier technology. Treatment duration varies depending on the size and number of areas being treated, with body treatments generally taking approximately 30 to 90 minutes. Since the procedure does not involve surgical incisions or stitches, most patients can return to their normal daily activities afterward.
When Will Ultherapy PRIME Results Become Visible, and How Long Do They Last?
One of the defining characteristics of Ultherapy PRIME is that results develop gradually through the skin's natural collagen-production process. Although some individuals may notice an initial sensation of tightness after treatment, the main improvements emerge as new collagen forms and tissue remodeling progresses. Visible changes in skin firmness and the appearance of laxity may generally begin to develop within two to three months, with further improvement possible over the following months.
According to information released by Merz Aesthetics, facial treatment results may last one year or longer, while results for the upper arms and abdomen may last six months or longer. However, the duration of the effects depends on individual factors, including age, skin quality, lifestyle, and biological response to treatment. Results around the knees may also vary, and the same duration should not automatically be assumed for every treatment area. Although a single session may be sufficient for many patients, the number of treatments and any future maintenance sessions should be determined individually.
Recovery and Downtime After Ultherapy PRIME
As Ultherapy PRIME is a non-invasive procedure that does not require surgical incisions, it generally involves little to no downtime. Most individuals can resume their normal activities immediately after treatment. However, temporary redness, mild swelling, tenderness, soreness, or tingling may occur in the treated area. These effects usually resolve within a short period, although occasionally discomfort may persist longer, and temporary nerve-related side effects can occur. Post-treatment recommendations should be provided by the treating physician based on the treatment area and individual needs.
Frequently Asked Questions About Ultherapy PRIME
Does Ultherapy PRIME really tighten loose skin on the body?
Ultherapy PRIME uses microfocused ultrasound energy to stimulate collagen and elastin production, potentially improving the appearance of mild to moderate skin laxity. Results vary depending on skin quality, age, degree of laxity, and individual response to treatment.
Can Ultherapy PRIME improve sagging skin on the upper arms?
Ultherapy PRIME may help improve the appearance of mild to moderate skin laxity on the front and back of the upper arms. However, it cannot replace a surgical arm lift for individuals with significant excess skin.
Can Ultherapy PRIME tighten loose abdominal skin?
The treatment is designed to improve the appearance of mild to moderate skin laxity in the abdominal area. It may be considered for individuals experiencing changes in skin elasticity after pregnancy or weight fluctuations. However, it is not intended for fat reduction, weight loss, or the removal of significant excess skin.
Can Ultherapy PRIME be used for wrinkles around the knees?
Yes. Ultherapy PRIME has received FDA clearance for improving the appearance of skin laxity around the knees. By stimulating collagen production, it may help the skin above and around the knees appear firmer and smoother over time.
Is Ultherapy PRIME painful?
Patients may feel brief sensations of warmth, tingling, or discomfort during energy delivery. The next-generation system includes technological improvements designed to enhance patient comfort, although individual pain tolerance varies.
How many Ultherapy PRIME sessions are needed?
Many patients may be treated in a single session. However, the recommended treatment plan depends on the area being treated, the degree of skin laxity, and individual aesthetic goals.
How long do Ultherapy PRIME body results last?
According to manufacturer-reported information, results on the upper arms and abdomen may last six months or longer. However, the duration varies between individuals, and the same longevity should not be assumed for every treatment area.
Can I return to my normal activities after Ultherapy PRIME?
Most patients can resume their daily activities immediately after treatment. Temporary redness, swelling, or tenderness may occur, but these effects are generally short-lived.
Does Ultherapy PRIME reduce body fat?
No. The primary purpose of Ultherapy PRIME body treatments is to stimulate collagen production and improve the appearance of skin laxity, rather than reduce fat deposits.
Is Ultherapy PRIME suitable for every age group?
Treatment suitability is not determined by age alone. Skin elasticity, degree of laxity, overall health, and individual expectations should all be considered. A medical consultation is necessary to determine the most appropriate treatment approach.
Can Ultherapy PRIME provide the same results as surgery?
Ultherapy PRIME is a non-invasive technology designed to improve the appearance of skin firmness. Although it may offer benefits for mild to moderate laxity, it cannot achieve the same degree of correction as surgical body-lifting procedures that remove substantial excess skin.
A New Era in Body Rejuvenation
The concept of rejuvenation in aesthetic medicine is no longer limited to addressing wrinkles and sagging on the face. Age-related changes in skin elasticity on the arms, abdomen, and knees are increasingly becoming part of a more comprehensive approach to aesthetic care. With expanded body treatment indications, microfocused ultrasound energy, and advanced real-time visualization, Ultherapy PRIME offers a non-surgical option that supports the skin's natural collagen and elastin production.
The goal is not to transform the body into something different, but to help the skin regain a firmer, smoother, and more youthful-looking appearance. After all, looking younger is not just about the face. It is also about the vitality, smoothness, and firmness we see and feel throughout our skin. With its next-generation body applications, Ultherapy PRIME extends the concept of natural-looking, gradual rejuvenation to new areas of the body.
