In short. Patches of numbness are common and usually settle. Brow weakness and contour change are uncommon, and they are why the depth decision and the operator matter.
Key points
- Any numbness or tingling is written down before you leave, so that the review compares against a record rather than a memory.
- Write down where it is and what it feels like on the first evening, and again a week later.
- A patch that has shrunk by half in a week is following the usual course; one that covers more ground is the one to report.
Every treatment has a list of things that commonly happen and a shorter list of things that rarely do. This guide separates them. The uncommon ones are the reason the depth decision exists, and they are worth understanding before a session rather than after one.
The common effects
Tenderness over the treated area for a few days is usual, and swelling is common and settles. Patches of numbness or tingling are the effect people ask about most: they appear when the energy reaches close to a small sensory nerve, and they usually resolve over days to weeks. A patch that is shrinking is behaving as expected; one that is spreading, or unchanged after several weeks, is assessed rather than watched.
The uncommon effects
Weakness in the brow is the one that matters most, and it is uncommon. It follows treatment at a level or in a place where a nerve that moves muscle has been affected rather than a sensory nerve. Where it happens the change is usually temporary and it is monitored rather than ignored, but it is why a face with existing weakness is not treated. A change in contour is the other uncommon outcome: fat that is treated loses volume rather than tightening, and that reads as a hollow rather than a lift.
What to record, and when
Any numbness or tingling is written down before you leave, so that the review compares against a record rather than a memory. Write down where it is and what it feels like on the first evening, and again a week later. A patch that has shrunk by half in a week is following the usual course; one that covers more ground is the one to report.
The ordinary risks of any energy treatment
A burn or a blister at the surface is possible if contact is poor or the skin is not adequately cooled. A change in pigmentation is more likely in darker skin and in recently sun-exposed skin, which is one reason recent exposure is a reason to postpone. Infection is uncommon, because there is no wound for it to enter.
The risk that belongs to the decision
The largest risk is not a physical one. It is spending a course of visits, and months of patience, on a change the treatment was never able to produce. That happens when the ceiling is not stated at the assessment.
Contact the clinic rather than waiting if
- A numb or tingling patch is spreading rather than shrinking, or is unchanged after several weeks.
- There is any weakness in the brow, any difficulty closing an eye, or a change in the shape of the face.
- A blister, a burn or spreading redness appears at the surface, or pain is worsening rather than settling.
How the depth decision prevents the uncommon effects is set out in The Depth Setting Decides the Result. What a normal course looks like over the following months is described in Results Over Months, Not Days.
Frequently asked questions
How long does numbness usually last after this treatment?
Most patches settle over days to weeks, and the usual pattern is a patch that shrinks steadily rather than one that disappears at once. A patch that is unchanged after several weeks, or that has spread, is assessed rather than watched further. No single interval applies to everyone.
If my brow feels weak afterwards, does it recover?
Usually it does. Where weakness follows treatment at the wrong level it is generally temporary, and it is monitored with review rather than left alone. The reason it is uncommon rather than routine is that the depth is chosen from anatomy, and the reason a face with existing weakness is not treated is to keep the picture clear if anything changes.
Can a course of treatment cause fat loss in the face?
It can, if the energy reaches a fat compartment rather than the layer being targeted. Fat that is treated loses volume rather than tightening, and a loss of volume in the face reads as a hollow. It is not corrected by more tightening, which is why the depth boundary is placed with fat as well as nerve in mind.
Risks & Limitations
- The result builds slowly and modestly, over roughly two to six months, and no outcome can be guaranteed. At the review point, more sessions of the same treatment are unlikely to be the answer if a standardised photograph shows nothing measurable.
- Patches of numbness and tingling over the treated area are common after a session. They usually settle over days to weeks, and a patch that spreads rather than shrinks, or that is unchanged after several weeks, requires assessment.
- Brow weakness and a change in contour are uncommon, and they follow treatment at the wrong depth. The layer being treated sits near a small sensory nerve in some places and near a nerve that moves muscle or a compartment of fat in others, so the depth is an anatomical decision rather than a technical setting.
- The surface is left intact, so there is no wound and no resurfacing effect. Pores, scars, pigment and creases etched into the skin are not changed, and nothing here removes skin or repositions a face that has descended.
When to Seek Care
- A numb or tingling patch that is spreading rather than shrinking, or that is unchanged after several weeks.
- Any weakness in the brow, any difficulty closing an eye, or a change in the shape of the face.
- A blister, a burn or spreading redness at the surface, or pain that is worsening rather than settling.
- Fever with warmth or discharge in the treated area — infection is uncommon because there is no wound, but it requires prompt assessment.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — procedure and safety guidance
- International Society of Aesthetic Plastic Surgery (ISAPS) — global aesthetic practice and safety guidance
- National Institute for Health and Care Excellence (NICE, UK) — relevant guidance
- Cochrane Library — systematic reviews
- Chinese Medical Association Plastic Surgery Branch — clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.