Scars darken because they were exposed to sun too early on in the healing process, or the type of skin you have. Micro-needling might be helpful followed by scar creams.
I don't see an actual infection and you can always send photos to your surgeon. You do have a few areas that have slightly opened and these can be treated with diluted Betadine solution with saline on gauze twice daily. If need, find a surgeon or physician near you and be checked. It is best to...