After Ultherapy (Ultherapy PRIME®) procedure, swelling is generally most noticeable at 2–3 days and mostly subsides naturally within 1 week. How many days swelling lasts is a common question during consultations. This is because the ultrasound energy creates thermal coagulation points in the deep skin layer (SMAS layer), causing a temporary tissue reaction, which is a natural sign that the skin has begun recovery and collagen regeneration.
The degree of swelling varies depending on the treatment area, number of shots delivered, and individual skin thickness and circulation. Areas with thin skin such as the eye area or jawline may feel relatively more swelling, and in many cases there is only subtle puffiness that is difficult for others to notice.
The typical progression by time period is summarized as follows.
| Period | General condition |
|---|---|
| Immediately after procedure – Day 1 | Heat sensation, redness, mild swelling |
| 2–3 days | Period when swelling is most noticeable |
| Around 1 week | Most swelling subsides |
| 1–2 weeks | Tenderness when pressed gradually disappears |



