One day, if you discover long red lines on your thighs, abdomen, or arms, you might be quite flustered. You'll likely wonder what these sudden red lines are and if they'll disappear on their own. To get straight to the point, it's highly likely to be red stretch marks, and now, while the color is still red, is the best time to start managing them.
What are these red lines, and why do they appear?
Stretch marks occur when the skin stretches faster than it can accommodate. When the skin is suddenly pulled due to rapid growth, pregnancy, or short-term weight changes, the collagen and elastic fibers in the dermis tear, leaving a trace.
When they first appear, they are accompanied by a vascular reaction, appearing red or purplish. This period is medically referred to as the red stretch mark stage, which is an active phase where skin regeneration is still ongoing.
Why is the red stage important?
Red stretch marks still have active blood vessels, and skin regeneration is in progress. Simply put, you can understand this as an early stage where there is still room for change.
The period when redness remains is an active phase where skin tissue is not yet stable, and management during this stage is known to influence the subsequent outcome.
In the clinic, we observe that even with the same stretch marks, the starting point for those who visit during the red stage is quite different from those who visit after they have already turned white.
What's the difference between red and white stretch marks?
Over time, the redness gradually fades, turning into white white stretch marks. As pigment disappears and skin tissue becomes fibrotic, the surface often becomes indented or more prominent.
| Category | Red Stretch Marks | White Stretch Marks |
|---|---|---|
| Stage | Early active phase of occurrence | Stable phase after time has passed |
| Color | Reddish, purplish | White, silvery-white |
| Vascular reaction | Active | Almost disappeared |
| Management outcome | Relatively quick response | May require more time and sessions |
White stretch marks can also be approached with stretch mark treatment, but it's true that they require more time and effort than the red stage. Therefore, it's generally easier to address them early when the color is still red.
Why it's good to manage them when they're red
If your stretch marks are still red, now is the time to consider management. It is reported that during the red stage, when vascular reactions are active, the skin's response to laser treatment is more vigorous.
However, not all red stretch marks show the same outcome. The following aspects may vary from person to person:
- Location and area of stretch marks
- Duration of redness
- Depth of dermal damage
- Usual skin elasticity and recovery tendency
- Lifestyle habits and degree of weight change
If you have any questions, feel free to leave them via chat consultation regarding the timing of red stretch mark treatment.
How do dermatologists approach it?
One method dermatologists use for red stretch mark management is the Vbeam Prima laser. This laser utilizes wavelength characteristics that selectively act on vascular lesions to alleviate the redness of stretch marks and aid in skin regeneration.
Of course, laser treatment outcomes can vary depending on an individual's skin condition, the depth and area of stretch marks, and lifestyle habits. It is crucial to determine the exact applicability and treatment plan through consultation with a medical professional.
When you feel you've missed the treatment window
Management is still possible even after stretch marks have turned white. However, since skipping the red stage can prolong the subsequent process, we recommend consulting a specialist quickly while the color is still red.
Even if your stretch marks have already turned white, there's no need to give up feeling that you've missed the treatment window. At any stage, the priority is to consult a specialist and find a method that suits you.
In conclusion
Red stretch marks are concerning in themselves, but it's wise to address them early because their color and tissue change if left untreated. Checking them during the red stage expands your options later on.
We recommend not bearing your skin concerns alone but discussing them thoroughly with a dermatologist. If you want to know more, please use chat consultation for red stretch marks.
Written by Dr. Sang-Joo Lee, Chief Director · Dermatologist
Dr. Sang-Joo Lee is a board-certified dermatologist and the chief director of Yonsei Star Dermatology Sinchon. He will serve as the president of the Korean Dermatological Association in 2026 and also works as an adjunct professor at the Department of Dermatology, Yonsei University College of Medicine, with extensive experience in pigment and scars.
View Dr. Sang-Joo Lee's Profile
First published April 24, 2026 · Last reviewed July 23, 2026
This article provides general information, and outcomes for stretch marks may vary depending on their stage and condition. Please consult a dermatologist to confirm the suitability of treatment.