i have some old whiteish stretch marks and decided to do microneedling on 12/25/18. I did my 1st treatment and was very surprised how fast and how quick my skin healed within a week, however, 5weeks later I’m not Really seeing much of a difference. I have noticed the stretch marks are a tad bit darker, but that’s it. Maybe I misunderstood my dermatologist but I assumed I would see a noticeable difference. how long does it take ? Is it worth getting another session ? Thank u