In my opinion, you have three issues in your question. You would benefit from an in-person consultation. Post inflammatory hyperpigmentation is most commonly treated with bleaching creams, chemical peels, micro-needling, IPL and fractionated erbium laser. Red scars are usually treated...
The answer is yes, Co2 fractional laser can be effective, however for older stretch marks I prefer insulated RF microneedling- less downtime, less redness. Try this cost effective method for DIY removal as it may work in some people, use a cheap DermaRoller and StrataMark. Take some pictures ...
I recommend following up with your Doctor for a formal evaluation and after care. I recommend skin care with vitamin c, b5 hydrator, silicone based scar gels with growth factors and enzymatic washes with papaya enzyme. PDT therapy can help calm inflammation. Typically I recommend adding clea...