Skin concerns
Stretch marks after losing weight, not gaining
Most marks were made while the weight went on. Losing it makes them more visible rather than creating them. Red ones respond better than white.
- Red or purpleRecent, and the most treatable stage
- Silvery whiteMature scar, and it changes far less
- Flatter, not goneNo treatment we found removes them
On this pageWhen they actually formed5
Quick answer
The bottom line
The marks people notice after losing weight were usually formed while the weight was going on, and became visible when the skin they sat in stopped being stretched tight. That timing matters, because it means the useful window for treatment has often already passed. Red or purple marks are recent and respond better to treatment than silvery-white ones, which are mature scars in the dermis and change only modestly with anything available. Our search found no treatment that removes them. Realistic aims are making them flatter and closer to your surrounding skin colour, using a retinoid on newer marks or clinic treatments such as microneedling and laser, and expecting partial improvement over months rather than removal.
At a glance
Three things worth remembering
- Colour tells you the age. Red or purple marks are recent and more treatable; silvery-white marks are mature scars and change far less.[2]
Section 01
When they actually formed
A stretch mark is a tear in the middle layer of skin, where the collagen framework gave way faster than it could be rebuilt. That happens when skin is stretched quickly, which means during weight gain, pregnancy or a growth spurt.[1][2]
So the marks appearing during weight loss were usually already there. While the skin was full and taut they were flattened and hard to see. As the volume underneath drops and the skin relaxes, they become obvious. It reads as new damage and is usually old damage becoming visible.[1][3]
This is worth knowing because it changes what you can expect. The moment when treatment works best is when a mark is new and still red, and that moment has often already passed by the time you are looking at it.[2]
Section 02
What the colour tells you
Red, pink or purple marks are recent. There is still active blood supply and the tissue is still remodelling, which is why treatment aimed at that phase has more to work with.[2]
Silvery-white or pale marks are mature. The remodelling has finished and what remains is settled scar tissue, thinner than the skin around it and with less pigment. Every treatment available works less well from here, and no honest clinic will tell you otherwise.[2][1]
On deeper skin tones a mature mark may look lighter than the surrounding skin and stay that way, which is a pigment difference rather than a texture one and needs a different conversation.[2]
Section 03
What actually helps
A topical retinoid has the most support for newer, still-red marks, used over months. It is not suitable in pregnancy, which is worth stating plainly given how many people are treating pregnancy-related marks.[2]
For clinic treatment, microneedling and fractional laser are the usual options. Both work by provoking controlled repair so the mark remodels closer to surrounding skin. Both need a course, both cost meaningfully, and both produce partial improvement rather than removal.[2][1]
Oils and butters sold specifically for stretch marks have not been shown to do more than any moisturiser. They make skin more comfortable, which is worth something, and they do not reach the layer where the mark is.[2][1]
Section 04
Whether they can be prevented
During weight loss the question mostly does not apply, because the stretching that causes them is not happening. The skin is relaxing, not tearing.[1][3]
Reviews of skin during rapid weight loss point at the same general levers as everywhere else in this area: enough protein, adequate hydration, and avoiding the very fastest rate of change your prescriber will allow. None of that has been tested against stretch marks specifically.[1][4]
Section 05
What to expect if you treat them
Improvement is measured in how much less visible a mark is from normal viewing distance, not in whether it has gone. Marks become flatter, closer in colour to surrounding skin, and less obvious in raking light. They remain findable if you look for them.[2][1]
That is a real result and it is worth money to some people. It is not what before-and-after photographs online tend to imply, and the gap between the two is where most disappointment with this area comes from.[2][5]
Your next step
Turn this into a practical plan
Choose the guide that best matches what you see. Each one starts with what to try, how long to wait and when to get help.