I was left with shiny scars after IPL treatment. What are my options?

You treated yourself with IPL and did this? IPL is attracted to color so putting color on the skin and expecting it not to target there isn't going to happen. So basically, you burned yourself. You need to see an expert to see if there are options. Bleaching creams may or may not help. Too hard to say without an in person consult to see the scarring. "This answer has been solicited without seeing this patient and cannot
be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."