Chemical peels (usually a series of peels) that exfoliate the skin can be used to lighten dark spots. There is a distinction though between true scars and dark spots.
I would caution you that in individuals with darker skin, the risk of post-inflammatory hyperpigmentation (i.e. darkening of the skin with any procedure) is greater. When I administer chemical peels for individuals with darker skin, I might start with a single coat of a light chemical peeling agent, e.g. sal acid. A test spot can also be done to see whether darker pigmentation occurs as a result of the application of the peeling agent.
There are certainly other topical agents that can help with dark spots and scarring either alone or in conjunction with peels, including hydroquinone, tretinoin cream (retin-a), among others.
I would consult with a doctor with considerable experience not only with administering chemical peels but dealing with chemical peel complications. Hope that helps.
