New stretch marks typically start as flat, pink patches of thinning skin that quickly develop into reddish or purplish raised lines. They’re usually several centimeters long and between 1 and 10 millimeters wide, running perpendicular to the direction your skin is being stretched. Their color comes from blood vessels showing through damaged, thinned-out skin.
The Earliest Signs Before Lines Appear
Before you see actual lines, the first sign is a patch of skin that looks flattened and slightly pink. This area may feel thinner than the surrounding skin, almost like it’s lost some of its cushion. You might also notice itching or a mild pulling sensation in that spot. This is the skin starting to lose structural support in its deeper layers as connective fibers break down under tension.
Within days to weeks, that pink patch progresses into visible streaks. These early lines are slightly swollen and raised to the touch, which surprises many people who expect stretch marks to feel like indentations. The raised texture is from mild inflammation as the skin responds to the damage happening below the surface.
Color, Texture, and Shape
Fresh stretch marks range from pink to red to deep purple, depending on your skin tone. On lighter skin, they tend to look bright red or pinkish. On darker skin tones, they often appear darker purple or even deep brown. The color intensity reflects how much blood flow is concentrated in the area as your body tries to repair the stretched tissue.
The lines themselves run in a specific direction. On your belly, they typically fan out from the navel. On your thighs and hips, they run vertically. On your breasts, they radiate outward. This pattern happens because they always form perpendicular to the direction the skin is being pulled. New stretch marks can feel slightly ridged or textured when you run a finger across them, unlike surrounding skin, which feels smooth.
Where They Show Up Most
Stretch marks concentrate on areas where the body stores fat or where skin stretches rapidly. The most common locations are the abdomen, breasts, hips, buttocks, upper arms, and thighs. During pregnancy, the belly and breasts are the primary sites. During puberty, hips, thighs, and breasts are typical for girls, while boys often develop them on the lower back and upper arms during growth spurts. Rapid weight gain or muscle building tends to produce them on the upper arms, chest, and thighs.
How They Change Over Time
The red or purple phase is temporary. Over months to a couple of years, the color gradually fades as inflammation calms and blood vessels recede. The marks flatten out, lose their raised texture, and eventually settle into silvery, white, or pale lines that sit slightly below the level of surrounding skin. On darker skin, mature stretch marks may appear lighter than your natural tone rather than white.
This color timeline matters because the window when stretch marks still look red is the window when they respond best to treatment. Once they’ve faded to white or silver, the underlying structure has fully scarred and is much harder to improve.
When the Appearance Signals Something Else
Ordinary stretch marks are common and harmless, but unusually wide, deep, or intensely colored marks can sometimes point to a hormonal imbalance. Stretch marks caused by excess cortisol production are notably broader and darker than typical ones, and they may appear in unusual locations or without an obvious trigger like weight change, pregnancy, or growth. If you develop prominent stretch marks without a clear reason, it’s worth mentioning to a doctor, since conditions involving cortisol overproduction can cause them.
Treating Stretch Marks While They’re New
The single most important factor in treatment success is timing. New, red stretch marks respond significantly better to treatment than old, white ones, regardless of which approach you use.
Prescription tretinoin cream is the most studied topical option for fresh stretch marks. In one clinical trial, patients who applied tretinoin daily for six months saw their stretch marks shrink by 14% in length and 8% in width, while the placebo group’s marks actually grew by 10% in length and 24% in width. A separate study of postpartum women found a 20% reduction in stretch mark size after three months of daily use. Tretinoin works by speeding up skin cell turnover and stimulating repair in the deeper skin layers, but it’s only effective on marks that are still in the red or purple phase.
Laser treatments can also target new stretch marks. Vascular lasers work by reducing the redness specifically, targeting the blood flow that gives new marks their color. Other laser types aim to remodel the scar tissue itself. Clinical observations show that red stretch marks respond better than white ones to laser treatment when measured by width, color, and texture improvement. The distinction between lasers that only address color and those that restructure the damaged skin matters, so this is a conversation worth having with a dermatologist if you’re considering that route.
Over-the-counter creams marketed for stretch marks (cocoa butter, vitamin E, bio-oil) have limited clinical evidence behind them. Keeping new stretch marks moisturized won’t hurt, but these products haven’t shown the kind of measurable improvement that tretinoin or laser treatments have in controlled studies.