What Can Be Done for White Scars?

White scars are characterized as scars that are hypopigmented whereby the pigment is lost. These scars are very difficult to treat as the process will have to stimulate the production of melanin in the area. This should be distinguished from vitiligo, which is an immunologic destruction of melanin by the body.
Depending on the location of the scars, the width, and the quality of the underlying tissue, the scars can be improved with specific lasers to stimulate pigmentary deposition, sun exposure, and excision.
The particulars of treatment can be managed by an experienced physician but should include a combination of surgery and laser/chemical peel treatment. Typically, these scars are much harder to treat than hyperpigmented dark scars.

If the scar is fine (and doesn't require re-excision and closure) and the only objection is the white of the line, they can be tattooed with a pigment to match the color as closely as is possible. If the line is wide, uneven, or depressed, it will require re-excision and a better closure.