Looking at your photos it doesn't appear that you have "scars". In dermatology the term is Dyschromia, most likely Hyperpigmentation. Depending on what caused the areas to become dark, they should fade over time. People who are at more risk usually have dark hair and eyes. Treatments that "heat" the skin can stimulate melanocytic activity such as laser hair removal. Prescription medication containing hydroquinone can help. See your dermatologist for an exam and the best recommendation.