Hello, Welcome to healthcare magic. From your history, I understand that you have scars from stitches. It is not very clear whether you are having dark marks left behind by stitches or if the stitch marks are raised or depressed below the skin surface. If it is only the stitch marks which are left behind( dark lines or patches), you could use a lightening cream containing 2-4% Kojic acid and Vitamin C combination at bedtime for 2-3 months. Use a good , broad spectrum sunscreen in the morning and at noon. If the scars are depressed below the skin surface, you could try Fractional laser treatment. You may need 6-8 sessions every 4 weeks depending on the response. If the scars are raised, you could take Triamcinolone injections into the scars by a qualified dermatologist to flatten them. You could also use a gel containing heparin extract and allantoin massaged twice a day onto the scar. Hope this helps you. Take care.