The Truth About Stretch Marks — What They Really Are and Why They're So Hard to Treat
Stretch marks might be one of the most universally experienced skin concerns on the planet — and yet they remain one of the least understood, most stigmatized, and most aggressively marketed-against conditions in skincare.
You've seen the ads. The creams that promise to "prevent" them during pregnancy. The oils that claim to make them disappear. The before-and-afters that show smooth skin where there was none.
Here's what dermatologists actually say — backed by science, not marketing.
What Are Stretch Marks, Really?
Stretch marks — medically known as striae distensae — are not a surface-level skin issue. They are a form of dermal scarring.
Stretch marks are a common dermatological condition characterized by linear, dermal scars that develop due to rapid skin stretching and disruption of dermal connective tissue. They are associated with physiological and pathological conditions involving hormonal changes or mechanical stress, such as pregnancy, puberty, weight fluctuations, muscle hypertrophy, and corticosteroid use.
What this means in plain terms: the damage happens in the dermis — the deep layer of skin beneath the surface. This is why most surface-level treatments have limited results. You're trying to reach a wound that lives deeper than most topical products can go.
The Science of What Happens Underneath
When skin stretches rapidly, the normally tight and dense collagen bundles in the dermis separate. Dr. Frank Wang, associate professor of dermatology at the University of Michigan, has studied this at a molecular level: the collagen bundles become disorganized and fail to re-bundle, resulting in the visible grooves that patients often want to eradicate.
His team also found that the elastic fiber network in the dermis gets disrupted in a stretch mark, and even after giving birth, this network remains disrupted. Elastic fibers give skin its elasticity, or the ability to "snap back" after stretching.
This is the core problem. The scaffolding that holds skin taut has been disrupted — and the body's repair process doesn't fully rebuild it the same way.
Who Gets Them
Almost everyone, at some point.
Stretch marks are common in females aged five to fifty years and frequently occur in association with adolescent growth spurts and pregnancy, and also occur in several pathological conditions such as obesity, Marfan and Cushing's syndromes, and as a result of long-term systemic or topical steroid use.
Common sites include the abdomen, thighs, hips, breasts, upper arms, and lower back — essentially anywhere the body experiences growth or change rapidly.
Some estimates suggest that about 15 to 20 percent of the population is genetically "stretch mark free." For everyone else, the question is not whether but when.
Genetics also play a role in color. Darker-skinned people tend to develop fewer stretch marks than fair-skinned people — though when they do occur on melanin-rich skin, the post-inflammatory hyperpigmentation that can accompany them may be more pronounced.
The Two Stages: Red and White
Understanding the stage of your stretch marks matters — because treatment works very differently depending on which stage you're in.
Striae rubra (red/purple stretch marks) — These are fresh stretch marks. The skin is still inflamed, the blood vessels are still close to the surface, and the dermis is actively remodeling. This is the window where topical treatment has the most impact.
Striae alba (white/silver stretch marks) — These are mature stretch marks. The inflammation has resolved, the skin has thinned and flattened, and the collagen disruption has settled. At this stage, surface-level creams have significantly less effect. More intensive clinical treatments — laser, microneedling, radiofrequency — are typically needed for visible improvement.
What the Research Says About Treatment
A systematic review of literature from 1976 to 2024 evaluated 69 articles across topical treatments, lasers and energy devices, and other therapies. Tretinoin at 0.1% and glycolic acid at different concentrations demonstrated clinical improvement, especially in recent stretch marks. Ablative and non-ablative lasers and radiofrequency with microneedles also presented good results.
The key phrase: especially in recent stretch marks. The evidence consistently shows that early intervention — while marks are still red — gives the best outcomes for topical treatments.
For older, white stretch marks: current evidence does not allow defining a single gold-standard treatment, and some published works are of low quality with small samples. In other words — anyone promising a sure-fire cure for mature stretch marks is overselling.
The Honest Truth About Prevention Creams
Most of the existing products are not based on solid scientific research, according to Dr. Frank Wang of the University of Michigan. Despite this, the stretch mark prevention market is worth billions globally.
This doesn't mean creams and oils are useless — it means their role is more about supporting skin health than preventing structural dermal damage. Keeping skin well-hydrated and nourished supports elasticity and may reduce the severity of marks that do form, but it cannot override genetics or the speed of skin stretching.
What Ingredients Actually Help
For daily home care, especially on newer stretch marks or as a preventive skin-nourishing routine:
Retinyl Palmitate (Vitamin A) — The gentler, body-safe form of retinol. Stimulates cell turnover, encourages collagen synthesis, and helps fade the discoloration that often accompanies stretch marks. Best used consistently over time.
Rice Bran Oil — Rich in ferulic acid, Vitamin E, and antioxidants. Supports the skin barrier, reduces oxidative stress, and delivers deep nourishment to skin that's been stretched and stressed.
Glycerin — A powerful humectant that keeps skin hydrated at the cellular level. Plumper, more hydrated skin has better elasticity and responds better to any treatment.
Exfoliation — Regular, gentle exfoliation removes dead skin cells and allows moisturizing and brightening ingredients to absorb more effectively. For stretch marks, this matters because the skin texture in that area is often uneven.
What to Realistically Expect
Stretch marks, especially mature ones, cannot be fully erased with topical skincare alone. But with consistent care, you can:
- Fade the discoloration associated with newer marks
- Improve the overall texture and hydration of the affected area
- Reduce the visibility of marks over time
- Support the skin barrier to minimize the severity of new marks forming
Progress takes months, not days. And that's okay.
A Note on Body Image
Stretch marks are a record of your body's story — growth, pregnancy, strength, change. They appear on athletes, on mothers, on teenagers, on people of every size and shape. They are not a sign of neglect, and they do not require correction to be acceptable.
But if you want to care for that skin — to nourish it, to help it look its best — that is entirely your choice, and it's a valid one. Skin care is self-care. And informed skin care is the best kind.
The Renude Snow Some Skin Premium Brightening Cream, formulated with retinyl palmitate, rice bran oil, and glycerin, was designed to support skin that needs consistent, gentle nourishment. Pair it with the Bare Body Scrub for the full routine.
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