Laxity after weight loss: what the skin can recover and what helps

Losing weight is an achievement. But, for many people, it comes with a less pleasant surprise: skin that does not keep up, that hangs loose on the belly, arms, thighs or chest. For some it is a mild aesthetic nuisance; for others, after major weight loss, it is a real physical problem, with irritation, difficulty finding clothes and even difficulty exercising.

The skin has some ability to tighten up again, but it has limits. Understanding what that capacity depends on helps to prevent what can be prevented, to give the body time and to know when it makes sense to seek treatment.

Why the skin becomes loose

The skin is elastic thanks to two proteins in the dermis: collagen, which gives strength, and elastin, which allows it to stretch and return to shape. When the body increases in volume, the skin stretches to keep up. If the increase is moderate and short-lived, the fibres recover. But when the skin is stretched for years:

• The elastic fibres fragment and lose the ability to “pull” the skin back.
• Collagen reorganises, sometimes with stretch marks, which are small scars of the dermis.
• The skin produces new tissue to cover the larger area, and this “excess” does not disappear when the volume decreases.

When the fat beneath decreases, a “casing” larger than its contents is left. That is laxity.

There is also a component that is not the skin: the loss of muscle mass during weight loss reduces the firm volume beneath the fat, and makes laxity more visible. That is why preserving muscle is part of prevention.

Where it is most noticeable

• Abdomen: the most frequent area, with skin that can form a fold over the pubic region.
• Arms: loose skin on the inner and back part.
• Thighs: especially the inner side.
• Breasts and chest: loss of volume and sagging.
• Buttocks: loss of volume and folds below.
• Back and flanks: side folds.
• Face and neck: with an article of their own (The face changed after weight loss: why, and what can be done).

What determines how much the skin recovers

And the speed of weight loss? It is common to hear that losing weight slowly prevents laxity. It makes sense in theory, and slower loss usually preserves muscle better, but there is little research showing that speed, in itself, changes the skin outcome. The total amount lost and age seem to weigh more.

How long to wait

The skin continues to remodel for months after weight loss. It is common to advise waiting until weight has been stable for at least 6 months before assessing treatments, and 12 to 18 months after bariatric surgery before considering body contouring surgery. Treating before then may mean repeating treatments if the volume continues to change.

Major weight loss: when the skin is more than aesthetic

After bariatric surgery, or major weight loss with the newest obesity medicines (such as GLP-1 agonists), the excess skin can be considerable. Studies of patients after bariatric surgery indicate that up to 80% want body contouring surgery, but only about one in five people actually has it, because of cost, access or fear of surgery (Kitzinger et al., 2012).

Excess skin can cause physical problems:

• Intertrigo: irritation and infections in the skin folds, from moisture and friction (fungi and bacteria).
• Itching, sores and bad smell in the folds.
• Difficulty exercising, because of friction and the weight of the skin.
• Difficulty finding clothes and discomfort when dressing.
• Impact on body image and intimate life, sometimes to the point of reducing satisfaction with the weight loss itself.

Caring for the skin of the folds

• Wash the folds daily and dry them thoroughly.
• Wear cotton underwear or technical fabrics that wick away moisture.
• Apply barrier products (for example, with zinc oxide) to areas of friction.
• See a doctor if there is persistent redness, sores, a bad smell or intense itching: they may be infections that need treatment.

If the excess skin is affecting your psychological wellbeing, talk to the team looking after you. Psychological support is part of care after major weight loss.

What helps

During weight loss

• Strength training, two to three times a week. It is the most important measure: it preserves and increases muscle, which “fills” part of the space left by fat and improves the contour, especially in the arms, buttocks and thighs.
• Sufficient protein, spread throughout the day, to support muscle mass and tissue repair.
• Not smoking. Tobacco degrades collagen and impairs healing, including that of any surgery.
• Sunscreen on exposed areas, so as not to add sun damage to the stretching.
• A varied diet, with vitamin C, zinc and other nutrients that take part in collagen synthesis. Deficiencies are more frequent after bariatric surgery; follow your team's supplementation instructions.
• Medical follow-up with large weight loss, so that the pace is safe.

Skincare

• Daily moisturising improves texture and comfort, but does not tighten the skin.
• Topical retinoids on the body may slightly improve skin quality over time, with caution because of irritation and never in pregnancy.
• “Firming” creams: many have a temporary tightening effect; they do not treat excess skin.

Honest expectations

With moderate weight loss and in younger people, the skin can adapt considerably over a year. With large weight loss, especially after the age of 40 to 50, part of the excess skin will remain, even when everything is done right.

Treatments: non-surgical and surgery

The choice depends mainly on the degree of laxity. A simple way of thinking:

In a surgical setting, specific scales are used (such as the Pittsburgh scale, developed for contour deformities after bariatric weight loss) to classify each area (Song et al., 2005).

Non-surgical treatments

• Radiofrequency: heats the dermis and stimulates collagen production. Gradual, moderate results, in series of sessions.
• Focused ultrasound: acts on deeper layers; also with a gradual effect.
• Radiofrequency microneedling and microneedling: combine stimulation of the dermis with improvement in texture and stretch marks.
• Injectable biostimulators (a medical procedure): stimulate collagen production in selected areas.

What to expect: visible improvement in texture and some firmness, especially in mild to moderate laxity. They do not remove excess skin. They often require maintenance.

Body contouring surgery

When there is significant excess skin, surgery is the only way to remove it: abdominoplasty, brachioplasty (arms), thigh lift, mastopexy, body lift. These are operations with visible scars and demanding recovery, which should be carried out with a stable weight, without tobacco and by plastic surgeons with experience in patients after major weight loss. In Portugal's national health service (SNS), some reconstructive surgery after bariatric surgery can be referred through the team that follows the patient.

At Luxmed, we assess the degree of laxity and explain honestly what non-surgical treatments can do for you. When the excess skin is significant, we say so and refer you for assessment by a plastic surgeon.

This article is for information purposes and does not replace a consultation. The results of any treatment vary from person to person.

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