Most acne scarring and pigmentation resolves with time. However a significant minority do have long-term issues and a number of treatment options are available including topical retinoids, sunscreens, depigmenting agents, chemical peels and LASER resurfacing. However one should seek these therapies only from a trained and experienced Dermatologist as improperly administered therapy can worsen the condition. Moreover not all therapies are suitable for everyone. If you are able to upload some pictures, I should be able to advice.
Dr. Sasi Attili