Stretch Marks: Why They Form and What Actually Helps

Stretch marks show up on nearly everyone at some point — during puberty growth spurts, pregnancy, weight changes, or periods of rapid muscle gain — yet they remain one of the most misunderstood marks on the body. Marketing around “stretch mark removal” creams implies they can be erased completely, but that promise oversells what any topical product can realistically deliver. Understanding what’s actually happening under the skin helps set expectations and points toward what genuinely helps.

A common misconception is that stretch marks are caused simply by skin “stretching too fast.” That’s part of the story, but not the whole picture — genetics, hormones, and the skin’s own collagen structure play a much larger role than most people realize, which is why two people can gain the same amount of weight and have completely different outcomes.

What’s Actually Happening in the Skin

Stretch marks (striae) form in the dermis, the middle layer of skin, when it’s stretched faster than collagen and elastin fibers can adapt. The connective tissue tears at a microscopic level, and as it heals, it forms a scar-like band that looks different from surrounding skin — thinner, often streaked, and initially reddish, purple, or dark brown depending on skin tone, before typically fading to a lighter, silvery tone over time.

This is why stretch marks are classified as a type of scarring rather than simple discoloration. Once that dermal structure changes, it doesn’t fully return to its original state, which is an important detail for setting realistic expectations about treatment.

Why Some People Get Them and Others Don’t

Rate of change matters — rapid weight gain, a fast-growing pregnancy belly, or quick muscle growth from intense training all increase the likelihood of stretch marks because the skin has less time to adapt gradually. But rate isn’t the only factor:

• Genetics: A family history of stretch marks is one of the strongest predictors, since collagen structure and skin elasticity are substantially inherited.
• Hormones: Cortisol, which rises during pregnancy, puberty, and periods of chronic stress, can weaken collagen and elastin fibers, making skin more prone to tearing under tension.
• Skin hydration and condition: Well-moisturized, healthy skin has somewhat more flexibility, though hydration alone won’t prevent stretch marks in someone genetically predisposed to them.
• Age: Younger skin, especially during adolescent growth spurts, is undergoing rapid change and is commonly affected.

This combination explains why stretch marks are extremely common — research suggests the majority of people, particularly the majority of pregnant women, develop some degree of striae, regardless of how carefully they moisturize.

What the Evidence Says About Prevention and Treatment

Many products marketed for stretch marks promise more than they can deliver. Here’s a realistic breakdown of what evidence actually supports:

• Moisturizing creams and oils (cocoa butter, shea butter, vitamin E): May improve skin comfort and elasticity slightly during rapid growth periods like pregnancy, but clinical evidence that they meaningfully prevent stretch marks is limited and mixed.
• Topical retinoids: Some research supports retinoids for improving the appearance of early-stage (still reddish/purple) stretch marks by stimulating collagen production, but they are not recommended during pregnancy or breastfeeding.
• Hyaluronic acid-based topicals: Some studies suggest a modest benefit for skin elasticity when applied during active stretching periods, though results vary.
• Laser therapy and microneedling: Performed by a dermatologist, these approaches have the most consistent clinical evidence for reducing the visible appearance of established stretch marks, working by stimulating collagen remodeling in the treated area.

No treatment, topical or procedural, completely erases stretch marks — the goal of any intervention is to make them less visible, not to restore skin to its pre-stretch-mark state.

A Practical, Realistic Skincare Approach

If you’re currently in a period of rapid change — pregnancy, a bulking phase, adolescence — a sensible, low-cost approach looks like this:

1. Moisturize daily with a fragrance-free, emollient-rich cream or oil, focusing on areas prone to stretching (belly, hips, thighs, upper arms).
2. Stay hydrated and maintain a nutrient-adequate diet, since skin health is influenced by overall nutrition, particularly protein and vitamin C, which support collagen synthesis.
3. Avoid extremely rapid weight change where it’s within your control, since gradual change gives skin more time to adapt.
4. If marks appear, treat them early while still reddish or purple — this is when topical retinoids (outside of pregnancy) and procedural treatments tend to be most effective.
5. Manage expectations — fading and softening are realistic goals; complete disappearance generally is not.

It’s also worth remembering that stretch marks carry no health risk whatsoever — they’re a cosmetic and often deeply normal feature of significant life changes like growth, pregnancy, or muscle gain, not a sign that anything is wrong with your skin or body.

When to See a Dermatologist

Most stretch marks don’t require medical attention, but a dermatologist can be helpful if marks are extensive, causing distress, or if you want to explore in-office treatments like laser therapy or microneedling. They can also help distinguish stretch marks from other skin conditions that occasionally look similar but require different care.

It’s worth being cautious with treatments offered outside licensed clinical settings, since procedures like microneedling and certain laser treatments carry risks — infection, scarring, or uneven pigmentation — when performed by unqualified practitioners or with poorly maintained equipment. A consultation beforehand also helps set realistic expectations for how many sessions a given treatment typically requires and what degree of improvement is reasonable to expect for your specific skin tone and mark severity, since results can vary considerably from person to person.

Do stretch marks ever fully disappear?

Rarely completely. Over time, most stretch marks fade from reddish or purple to a lighter, silvery-white tone and become less noticeable, but the underlying texture change in the skin generally remains to some degree.

Can men get stretch marks too?

Yes. Stretch marks are common in men, especially with rapid muscle growth, growth spurts during puberty, or significant weight change — they’re not exclusive to pregnancy or women.

Does drinking more water prevent stretch marks?

Hydration supports overall skin health, but it hasn’t been shown to reliably prevent stretch marks on its own, since genetics and rate of stretching play a much larger role.

Are expensive stretch mark creams worth it?

Not necessarily. Evidence doesn’t strongly support premium formulas over basic, fragrance-free moisturizers for prevention. If you want a treatment with stronger evidence for existing marks, a dermatologist-guided option like a retinoid or in-office procedure is more likely to show results.