Striae Assessment · Staging · CityLink Mall
Stretch marks are scars in the dermis, not marks on the surface. Red striae are an active, inflamed, still-remodelling injury and respond far better than white ones — which is why the single largest determinant of outcome is how long you waited.
A stretch mark is a scar. Not a pigmentation problem, not a surface texture problem, and not something sitting on top of the skin that could be sanded away — a linear scar formed in the dermis when the tissue was stretched faster than it could adapt. Understanding that one fact resolves most of the confusion around what does and does not work on them.
The dermis has considerable tensile capacity, but it is finite and it is rate-dependent. Slow expansion allows fibroblasts to lay down new collagen and remodel the elastic network to match. Rapid expansion does not, and the collagen and elastic fibres rupture and reorganise along the line of tension. The overlying epidermis thins over the defect, which is why a mature striae is slightly depressed and has a faintly wrinkled, tissue-paper quality when the skin is compressed.
Mechanical stretch is only half of it. Glucocorticoids impair fibroblast collagen synthesis directly, reducing the dermis's capacity to keep up with the load placed on it. That is why striae accompany pregnancy, adolescent growth spurts and rapid weight gain — all periods of elevated corticosteroid activity as well as mechanical expansion — and why they also appear with prolonged topical or systemic steroid use and in Cushing's syndrome, sometimes with very little stretching involved at all.
What follows is a two-stage natural history, and it matters more than anything else on this page. In the early phase, the scar is inflamed: vessels are dilated, fibroblasts are active, remodelling is still under way, and the mark is red or purple. Over months to years, the inflammation resolves, the vascularity regresses, elastin content falls and the mark settles into a white, atrophic, permanent form. The tissue is amenable to influence while it is still remodelling and far less so once it has finished.
Types
Striae are staged by colour, and the stage is not cosmetic terminology — it describes what is happening in the dermis and therefore what any treatment has to work with. Red and white striae are the same lesion at different points in its life, and they respond so differently that treating them as one condition is the commonest reason stretch mark treatment disappoints.
A red stretch mark is a scar still being written. A white one has been finished for years — and finished scars improve, but they do not vanish.
Timing
The window in which striae are most responsive is the one in which most people decide to wait and see. Red striae — most commonly the ones that appear during pregnancy — are frequently expected to fade, and in a sense they do — they fade into white ones, which is not the same thing as resolving. What is actually happening during that period is that the inflammation and vascularity are regressing, fibroblast activity is winding down, and the scar is consolidating into its permanent form. Treatment delivered while remodelling is still under way is working with an active process; treatment delivered afterwards is attempting to restart one.
In practical terms this means the abdomen at three months postpartum and the abdomen at three years postpartum are different clinical problems, even if the patient's complaint is worded identically. In the first, vascular-targeted and fractional collagen-wavelength approaches can influence a scar that has not finished forming, and the aim is genuinely to alter the outcome. In the second, the aim is to remodel a mature atrophic scar — to thicken the dermis beneath it, improve texture and soften the contrast at its edges. Both are worth doing. They are not the same undertaking and they should not be sold as though they were.
Expectations should be set in those terms rather than in percentages. Red striae treated early can become substantially less visible. White striae treated well look better lit, better textured and less sharply demarcated, and often stop being the first thing the patient sees — while remaining findable if you go looking. Deeper phototypes carry an additional consideration, since aggressive resurfacing in Asian skin risks post-inflammatory pigment change that is more conspicuous than the striae themselves, and calibration matters more here than intensity.
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1 Raffles Link, #B1-28, CityLink Mall, Singapore 039393 · +65 8023 7170
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