Double eyelid scars can be treated with dot matrix laser. Dot-matrix laser can selectively act on the skin tissue of the lesion, and adopt the same wavelength according to different scars. Laser has the effects of abrasion and anti-inflammation, which can help to repair concave and convex symptoms, stimulate the regeneration of collagen, and contribute to local improvement.

As for how long the scar can be formed, it depends on the severity of the scar and the individual's recovery. Generally speaking, if the scar is not particularly serious, laser treatment can be done in about 3 months. If the scar is serious, the time needed may be prolonged, and it may take about 6 months to do laser treatment.

The above information is for reference only. It is recommended to consult a professional doctor for more accurate information.