How can I lighten a dark boil scar on my buttocks? (photos)

The treatment of scars on the face and body follows a protocol-based approach in our office. We start by characterizing the scars in terms of redness, atrophy, hypertrophy, size, volumetric biometrics, and color hyperpigmentation and then devise a customized protocol for you. Our Hidef scar protocol uses micro fractional and fractional RF, fractional laser, sublative RF, vbeam therapy, injection based IIT, and scar modulation. Scars that exhibit growth should begin treatment with Plato's Scar Serum twice daily followed by Melarase AM and Melarase PM for dark and discolored scars.
Best, Dr. KaramanoukianRealself100 Surgeon

this needs cosmelan peel or enlighte peel or at least cosmelan 2 cream + vivatia foam and phytoplus.  this needs sunproection and will take a while to Improve. see emeragecosmetics.com link you can do this peel at home and then you can do virtual consult for free skincare assessment.
Hyperpigmentation from any type needs a combination approach of peels like cosmelan,  lasers like clear and brilliant and aerolase or laser genesis, radiofrequency like venus viva, and constant skin care and sun protection.  Bimontly facials with silk peel dermalinfusion is essential to hydrate, exfoliate and infuse vitamins and antioxidants into the skin.  If you have acne you can do additional treatments and peels to get more improvement.  I suggest a formal consultation with an expert in lasers and peels. Best, Dr. Emer.

Dear Lharris223,
it is hard to tell for sure without an examination. Based on your photos, it looks like your scar can be improved with microneedling, prp, laser treatment. If you are considering a treatment, I would suggest you to consult a board-certified plastic surgeon. Only after a thorough examination you will get more information and recommendations.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery