Stretch Mark Treatment Guide

What Are Stretch Marks?

Stretch marks, known medically as striae distensae, are a form of dermal scarring. They occur when the skin is stretched rapidly beyond its elastic capacity, causing the collagen and elastin fibres in the dermis (the deeper structural layer of the skin) to rupture. The skin's surface remains intact, but the underlying support structure is damaged, resulting in the characteristic indented, textured lines that we recognise as stretch marks.

It is important to understand that stretch marks are not a sign of poor skincare, and they are not caused by a lack of moisturising. They are a structural injury to the dermis, influenced by factors that are largely outside your control: the rate at which your body grows or changes size, your genetic predisposition to dermal tearing, and your hormonal environment at the time of the stretching.

Common causes

• Pregnancy. The abdomen, breasts, hips, and thighs are the most commonly affected areas. Hormonal changes during pregnancy also soften collagen, making the skin more susceptible to tearing.
• Adolescent growth spurts. Rapid height or weight gain during puberty frequently causes stretch marks on the back, thighs, hips, and upper arms.
• Weight fluctuations. Rapid weight gain or loss can stretch or contract the skin faster than it can adapt.
• Muscle building. Rapid muscle growth, particularly in the upper arms, chest, and shoulders, is a common cause in men.
• Hormonal factors. Elevated cortisol levels (whether from stress, medication such as corticosteroids, or conditions such as Cushing's syndrome) reduce the skin's elasticity and increase susceptibility to stretch marks.

Treatments That Work

Effective stretch mark treatment requires modalities that can reach the dermis and stimulate collagen remodelling in the damaged tissue. The following treatments have the strongest evidence base and are the ones we use most frequently at Berkshire Aesthetics.

Morpheus8 RF microneedling

Morpheus8 is often our first-line treatment for stretch marks. It combines radiofrequency (RF) energy with microneedling to deliver controlled thermal energy into the dermis at adjustable depths of up to 4mm. The RF energy heats the tissue, triggering a wound-healing response that produces new collagen and elastin. The microneedles create micro-channels that further stimulate repair. For stretch marks, this dual mechanism is particularly valuable: the needles physically break down disorganised scar tissue, while the RF energy promotes the formation of new, organised collagen to replace it.

Most patients require a course of three to four sessions, spaced four to six weeks apart. Improvement is gradual, with results continuing to develop for up to six months after the final session as collagen remodelling progresses.

Fractional CO2 laser resurfacing

Fractional CO2 laser is one of the most well-studied treatments for stretch marks. The laser creates microscopic columns of controlled thermal injury in the skin, leaving surrounding tissue intact to drive healing. This triggers significant collagen remodelling and can improve both the texture and the depth of stretch marks. The Alma Hybrid system we use at our clinic combines ablative CO2 with non-ablative 1570nm wavelengths, allowing us to tailor the treatment intensity to the individual case.

CO2 laser is particularly effective for textural improvement, addressing the indented, atrophic quality that characterises mature white stretch marks. Downtime is typically five to seven days, during which the treated skin will appear red and feel tight. A course of two to four sessions is usually recommended.

Polynucleotides

Polynucleotide injections deliver purified DNA fragments into the skin to stimulate fibroblast activity, promote tissue repair, and improve hydration. For stretch marks, polynucleotides can help rebuild the dermal matrix by encouraging the production of new collagen and elastin in the damaged area. They are particularly useful as a complementary treatment alongside Morpheus8 or CO2 laser, enhancing the overall repair response.

Medical microneedling

For milder or newer stretch marks, medical microneedling (such as SkinPen) can be an effective and well-tolerated option. The fine needles create controlled micro-injuries that trigger the skin's natural repair mechanisms, stimulating new collagen production. While not as intensive as RF microneedling or laser, medical microneedling can produce meaningful improvement with minimal downtime, making it a good starting point for patients who are new to clinic-based treatments or who have milder stretch marks.

Realistic Expectations and Treatment Timelines

We are always transparent with patients about what stretch mark treatment can achieve. The goal is significant improvement, not complete removal. Most patients can expect a noticeable reduction in the depth, width, colour, and texture of their stretch marks, but it is unlikely that the marks will disappear entirely. Treated skin will look and feel closer to the surrounding normal skin, but a degree of textural difference may remain.

Improvement is gradual. Collagen remodelling is a slow biological process that continues for months after each treatment session. Patients should allow at least three to six months after completing their course to assess the full results. We typically review patients at the three-month mark to evaluate progress and determine whether additional sessions would be beneficial.

The timing of treatment also matters. Newer red stretch marks respond more readily than older white ones, so seeking treatment earlier generally leads to better outcomes. However, we regularly treat mature stretch marks that are years or even decades old, and patients are often pleasantly surprised by the degree of improvement that is achievable.

A typical treatment programme involves three to four sessions of Morpheus8 or CO2 laser, spaced four to six weeks apart, with optional polynucleotide treatments between sessions to enhance the repair response. The total treatment timeline from first session to final result assessment is usually six to nine months.