I Am Left with Dark Spots After Laser Treatment for Stretch Marks Removal?

Hyperpigmentation can ruin your skin and can be caused by either PIH (post-inflammatory hyperpigmentation), melasma, age or sun spots, and chronic inflammation.  Starting treatment is easy with topical creams; followed by laser and light therapy. I would use a combination skincare protocol that includes topical Melarase creams first, followed by a combination of light fractional laser, depigmenting lasers and IPL, vascular pulsed dye laser, and Covalent peels. 
Recommended Creams: Melarase Brightening Kit
MelaClenz
Melarase AM
Melarase PM
Melapads
Replenish Retinoid Cream
Best, 
Dr. Karamanoukian
Realself100 Surgeon

Thank you for your question. Ethnic skin should be very cautious when it comes to treatments with lasers. For post inflammatory hyperpigmentation, which is what you are experiencing, you should use sunscreen everyday with SPF 30 with zinc oxide, and use bleaching creams containing hydroquinone for the  next 2 months to reduce the discoloration. The use  of sunscreen and sun avoidance is most important.  Be certain to be under the supervision of a board certified dermatologist or plastic surgeon with expertise in laser procedures and ethnic skin for the most effective and safe treatments. I hope this helps