Stretch marks that are still red, pink, or purple are in their active growth phase, and this is the window when you can actually slow or stop them from expanding. Once they fade to white or silver, the damage to the deeper skin layer has already scarred over, making them much harder to treat. If your stretch marks still have color, you have a real opportunity to intervene.
Why Stretch Marks Keep Growing
Stretch marks form when the middle layer of your skin (the dermis) tears because it’s being stretched faster than it can adapt. The collagen fibers that give skin its structure lose their organized alignment, the elastic network breaks down, and the result is a visible lesion on the surface. Research shows that stretch-marked skin has roughly 33% less collagen fiber density than normal skin. The tearing doesn’t happen all at once. As long as the underlying cause persists, whether that’s rapid weight gain, a growth spurt, pregnancy, or muscle building, the marks can continue to lengthen and widen.
The red or purple color of a newer stretch mark comes from inflammation and increased blood flow at the site. This “active” stage is called striae rubra. Over time, the inflammation fades, blood vessels recede, and the mark turns pale or white, a stage called striae alba. Biophysical testing shows that both stages have similar levels of hydration and elasticity, meaning the structural damage is set early. That’s why acting during the red phase matters so much.
Slow the Rate of Skin Stretching
The single biggest factor in whether stretch marks keep growing is how fast your skin is being pulled. Rapid weight gain is one of the strongest risk factors. If you’re in a bulking phase, pregnant, or gaining weight for any reason, slowing the rate of change gives your skin more time to adapt. For muscle building, this might mean extending your bulk over a longer timeline. For pregnancy, steady and gradual weight gain within recommended ranges helps reduce the severity of new marks.
You can’t always control the cause. Puberty growth spurts and certain medications (like corticosteroids) stretch the skin in ways you can’t easily pace. But when the rate of expansion is something you influence, keeping it gradual is the most effective prevention strategy available.
Keep Skin Hydrated and Elastic
Well-hydrated skin is more elastic, and more elastic skin resists tearing better. This isn’t just common sense. Studies have confirmed a direct correlation between skin hydration and skin elasticity, and skin with higher elasticity is less likely to develop or worsen stretch marks. In one study, stretch mark lesions faded significantly and skin elasticity improved after six weeks of consistent moisturizer use.
The key is consistency. Apply a moisturizer or emollient to the areas under tension (abdomen, thighs, hips, upper arms, breasts) at least once or twice daily. Look for products containing hyaluronic acid, which pulls water into the skin, or plant-based oils that support the skin barrier. Massage the product in for a minute or two. The mechanical action of massage itself may help improve circulation to the area.
One important note: cocoa butter and olive oil, despite their popularity, have been tested in randomized controlled trials and shown to be no better than placebo at preventing or reducing stretch marks. Their moisturizing effect isn’t zero, but they don’t offer any special advantage over other hydrating products.
Topical Treatments That Have Clinical Evidence
Prescription retinoid cream is one of the few topical treatments with strong clinical data behind it. In a six-month trial, 80% of patients using tretinoin cream on early, active stretch marks saw definite or marked improvement, compared to just 8% in the placebo group. The treated stretch marks decreased in length by 14% and width by 8%, while untreated marks actually grew, increasing 10% in length and 24% in width over the same period. That contrast is striking: without treatment, active stretch marks continued expanding, while tretinoin reversed the trend.
Retinoids work by accelerating skin cell turnover and stimulating collagen production in the dermis. They’re only effective on newer, colored stretch marks and are not safe during pregnancy or breastfeeding. You’ll need a prescription, and mild irritation is common in the first few weeks of use.
Centella asiatica extract is a plant-derived ingredient with growing evidence. A formulation tested over four weeks significantly increased skin thickness, vascularization, and elasticity at the stretch mark site compared to placebo. At the cellular level, it boosted collagen fiber density by 49% and elastin production by 37% in stretch-marked skin samples. It works by restoring the organized collagen and elastin network that stretch marks disrupt. You can find it in over-the-counter creams, often labeled as “cica” or centella extract.
Support Collagen Production From the Inside
Your skin’s dermis is about 75% collagen by dry weight. The fibroblast cells that build and repair this collagen matrix depend heavily on vitamin C. Without adequate vitamin C, collagen synthesis drops and the balance between collagen and elastin in the dermis shifts. Vitamin C acts as a required cofactor for the enzymes that stabilize collagen’s structure, and it also promotes the expression of collagen genes. In practical terms, this means your body literally cannot repair stretched skin properly if you’re low on vitamin C.
Zinc plays a supporting role in wound healing and tissue repair. Getting enough protein matters too, since collagen is built from amino acids. None of this replaces topical treatment or managing the rate of skin stretching, but a diet rich in fruits, vegetables, and adequate protein gives your skin the raw materials it needs to keep up with demand. Think of it as removing a bottleneck rather than adding a miracle cure.
Professional Treatments for Active Stretch Marks
If your stretch marks are actively growing and topical treatments aren’t enough, pulsed dye laser therapy targets the red, inflammatory stage directly. The laser energy is absorbed by the blood vessels giving the marks their color, which triggers a wound-healing response in the dermis. In clinical studies, treated stretch marks regained normal-appearing elastin content compared to the untreated skin around them, with visible improvement and increased dermal elastin observed eight weeks after treatment. Multiple sessions are typically needed, spaced several weeks apart.
Microneedling is another option that creates tiny controlled injuries in the skin, prompting collagen remodeling. It’s most effective on newer marks and is often combined with topical treatments like hyaluronic acid or vitamin C serums applied immediately after the procedure, when absorption is maximized. Results develop over weeks to months as new collagen forms.
Both treatments work best when stretch marks are still in their colored, active phase. Once marks have turned white and the inflammatory process has ended, the window for these interventions narrows considerably, though some improvement is still possible.
A Realistic Timeline
Stretch marks don’t stop growing on a fixed schedule. As long as the skin is under tension and the dermis continues to tear, marks can lengthen and widen. Once the underlying cause stabilizes (weight plateaus, pregnancy ends, a growth spurt finishes), the active phase gradually winds down. The red or purple color fades over a period of months, eventually settling into pale, silvery lines.
Topical retinoids showed measurable results within two months in clinical trials, with the most significant improvements at six months. Centella asiatica produced visible changes in four weeks. Consistent moisturizing improved skin elasticity and faded lesions over six weeks. These timelines set reasonable expectations: you won’t see overnight changes, but with consistent daily effort during the active phase, you can meaningfully limit how far stretch marks spread and how visible they remain long-term.