Before you start looking for a treatment
Skin keeps contracting long after weight loss has finished. The remodelling process takes months and usually does not end sooner than a year after the weight has stabilised.
That is why the first recommendation is: wait with the decision about a treatment until your weight has stabilised, and give the skin time. A treatment carried out during weight loss judges a situation that is still going to change.
On this page
Why the skin does not go back
Skin has the ability to contract, but it is limited and depends on the state of its fibres. With long stretching, the network of collagen and elastin in the dermis remodels itself: elastin fibres lengthen and partly lose their springiness, and some of them break. A stretch mark then forms.
After a loss of volume what remains is a surface area of skin fitted to the previous shape of the body. Part of the excess will contract over the following months, but if the fibres have been permanently damaged, the skin will not regain its firmness on its own.
Two problems often occur together and it is worth separating them. Laxity is an excess of skin surface. Stretch marks are scars in the places where the skin split. They require a different approach, although they arose from the same cause.
What decides how much it will shrink back
How much skin contracts on its own differs very greatly between people, and most of these factors cannot be changed. It is worth knowing them in order to judge your own situation realistically.
Age
The later the weight loss happens, the smaller the skin's ability to contract. After the age of forty, collagen and elastin decrease regardless of body weight.
How many kilograms
With a loss of several tens of kilograms the excess skin is usually too great for it to contract on its own, whatever the other factors.
How long the excess weight lasted
Skin stretched for years remodels itself more deeply than with a short period of increased weight. Time matters more here than the number of kilograms alone.
The pace of weight loss
Losing weight fast gives the skin no time to adapt. Gradual weight loss lets it partly keep up with the change in volume.
Genetics
The quality of collagen and elastin fibres is largely determined genetically. This explains why two people after a similar weight loss look completely different.
Muscle mass
Muscles fill the volume that fat tissue used to occupy. Keeping them during weight loss reduces the excess skin that will remain afterwards.
Smoking and photoageing
Both weaken the fibre network of the dermis, so they worsen its ability to contract. These are factors you can influence.
Two of these factors depend on decisions: the pace of weight loss and keeping muscle mass. The rest are given. That does not mean laxity is anyone's fault; it means that when planning it is worth taking into account what can be controlled.
Three degrees of laxity and what follows from them
This distinction decides which path to take, and sometimes decides that an aesthetic medicine clinic is not the right address.
First degree: skin without firmness, without excess
The skin lies flat but is thinner, less springy, and its texture shows more clearly. It does not form folds or sag. Common with a loss of up to fifteen kilograms in younger people.
Non-invasive methods make the most sense here and have a real scope for improvement.
Second degree: visible laxity, a small excess
The skin sits loosely; a fold forms when the body changes position, but it does not sag permanently. The most common situation after a loss of twenty to thirty kilograms.
Non-invasive methods improve the firmness and quality of the skin, but they will not remove the excess surface. The result can be partial.
Third degree: a permanent excess of skin
The skin sags and forms a permanent fold, sometimes with chafing within it. Typical after a large weight loss or after bariatric treatment.
The right direction is plastic surgery. Non-invasive methods will not reduce the surface area of the skin.
The line between the second and third degree is the one that is hardest to talk about, and that is why we say it plainly: where there is an excess of skin that sags and forms a fold, no non-invasive method will remove tissue. It can improve its quality, but it will not reduce its surface area.
The methods and their real reach
All non-invasive methods work in the same way: they deliver a stimulus to the skin that starts the remodelling of collagen. They differ in depth and strength, but they share a limit they will not cross.
Energy delivered by needles into the dermis, at a controlled depth. The method most often considered for laxity, because it works in the layer where the problem lies, with the epidermis left intact.
Degree 1 and 2
Radiofrequency thermal lifting
Heating the dermis without breaking the surface, in a course of treatments. Gentler than the microneedling method and with a smaller reach, used with slight laxity.
Degree 1
Fractional ablation with a strong stimulus to remodel. Considered on smaller areas where a clearer change in the quality of the skin is needed. It requires time to rebuild.
Degree 1 and 2
Lifting and supporting the tissue. Effective on selected areas, above all the face and neck. On large areas of the body the possibilities are limited.
Degree 1 and 2, selected areas
Preparations that prompt fibroblasts to produce collagen. An approach aimed at the quality and density of the skin, not at removing excess surface.
Support
Intradermal injection of nourishing preparations. It improves hydration and the condition of the skin, which affects how it looks, but not firmness in the mechanical sense.
Support
Electrical stimulation of the muscles, aimed at their tone and volume. Filling volume with muscle changes how the skin sits, although it does not act on it directly.
An addition
On larger areas of the body the therapy is long and costly, because the surface is many times greater than on the face. It is worth working that out before starting, together with the real scope for improvement, so that the decision is an informed one.
Where aesthetic medicine ends
When the right direction is plastic surgery
The skin forms a permanent fold that sags whatever the position of the body.
Chafing, irritation or inflammation appears within the fold.
The excess skin makes physical activity or choosing clothes difficult in a way that affects everyday life.
The weight loss exceeded several tens of kilograms, especially after bariatric treatment.
Earlier courses of non-invasive treatments brought no improvement, and the degree of laxity did not change.
We do not carry out surgical removal of excess skin, such as abdominoplasty or arm lift. If the assessment shows that this is the right approach, we say so at the consultation and refer you on, rather than proposing a course of treatments that will not solve the problem.
Non-invasive methods do, however, make sense with the third degree as well, in one role: as preparing the skin before surgery or working on its quality afterwards. That is a supporting approach, not an alternative.
What to do during weight loss
If you are in the middle of losing weight, some things can still be done, and they matter more than any treatment carried out later.
1
Lose weight gradually
A slower pace gives the skin time to adapt partly. It will not prevent laxity with a large weight loss, but it reduces its extent.
2
Keep your muscle mass
Strength training during weight loss limits the loss of muscle. Muscles fill the volume that fat tissue frees up, so the skin has something to sit on.
3
Take care of protein in your diet
Collagen and elastin are built from amino acids. A shortage of protein during weight loss worsens the skin's ability to rebuild, whatever the external care.
4
Moisturise the skin and protect it from the sun
Photoageing weakens the fibre network, so it worsens the ability to contract. It is the same mechanism we describe under photoageing of the skin.
5
Consider treatments during weight loss
With a large planned weight loss, some people start work on the quality of the skin earlier, to support its remodelling while the volume changes. That is a decision to discuss at the consultation, because it does not make sense in every situation.
None of these things gives a guarantee, because the springiness of skin depends largely on genetics and age. They do affect how much the skin manages to contract on its own, and that is the part that cannot be recovered later with a treatment.
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NL Clinic, Katowice
How the content is created
Last updated
15 August 2026
This material is informational in nature and does not replace a consultation or qualification.
The questions we are asked most often
Will skin go back on its own after weight loss?
Partly, and it depends on many factors: age, the number of kilograms, how long the excess weight lasted, the pace of weight loss and genetics. Skin keeps contracting for months after the weight has stabilised, usually not finishing that process sooner than a year. If the elastin fibres have been permanently damaged, full firmness will not return.
When is the best time to start treatments?
After the weight has stabilised, when the skin has had time to contract on its own. A treatment carried out during weight loss judges a situation that is still going to change, and the result may be distorted by a further change in volume. The exception is work on the quality of the skin supporting its remodelling, which some people start earlier; that is an individual decision.
Will non-invasive treatments remove excess skin?
No, and that is the most important thing on this page. Non-invasive methods improve the firmness, density and quality of the skin, but they do not reduce its surface area. If the skin forms a permanent fold, no course of treatments will remove it, and the only approach that reduces the surface area is surgery.
How do I know whether I need surgery?
The pointer is whether the skin sags whatever the position of the body and whether it forms a permanent fold, especially with chafing within it. With a loss of several tens of kilograms, particularly after bariatric treatment, surgery is usually the right direction. At the consultation we say so plainly, rather than proposing a course that will not solve the problem.
Do you carry out operations to remove excess skin?
No. We do not carry out procedures such as abdominoplasty or an arm lift. If the assessment points to such a need, we refer you to plastic surgery. We can, however, work on the quality of the skin before surgery and after it, as a supporting approach.
How long does the therapy take and how many sessions does it involve?
Methods that work on the firmness of the skin require a course, and the result builds up over months along with the remodelling of collagen. On large areas of the body the therapy is correspondingly longer and more costly than on the face, because the surface is many times greater. It is worth working that out before starting, together with the real scope for improvement.
How does laxity differ from stretch marks?
They are two different problems with the same cause. Laxity is an excess of skin surface that has lost its firmness. A stretch mark is a scar in the place where the skin split while being stretched. They require a different approach and often occur together, which is why a plan usually covers both, but with separate methods.
Will creams and oils help?
As part of skin care during weight loss they make sense: well moisturised skin with a stable barrier copes better with a change in volume. They will not rebuild broken fibres or reduce excess surface. That is support, not a method.
Will training help with lax skin?
Not with the skin itself, but with how it sits. Muscles fill the volume that fat tissue frees up, so keeping muscle mass during weight loss reduces the excess skin that will remain afterwards. It is one of the few factors you really can influence.
The content is for information. It does not replace a consultation, an examination or an individual assessment.