Yes it's ok what size roller are you using?
I did 3 0.5mm rolls over 3 weeks, which was OK, I only was a little red for a few days. I then tried a 1.0mm where for the first 3 weeks my skin was peeling like crazy and was very red for a month, and over 3 months I'm still slightly red but it is fading.
I think I might stick with 0.5mm.
I don't see a problem with that. It's just like dermastamping except the needles are on a roller. .5mm won't help with scarring, only product penetration. You have to roll with at least a 1.5mm to help with scars. Inbetween 1.5mm sessions, use your .5mm to help with product penetration. That's what Dr. Fernandez does with his patients.
Why don't you do some glycolic acid peels? It'll get rid of red marks, freckles, brown spots,etc. I've had professional peels done before at a high % so I was able to start with 30% gylcolic acid with no problems. I didn't peel at all and read that most people don't peel from this type of peel. There's no downtime. My skin was red for a day...your skin may react differently though. It takes about 5 peels to get rid of red marks...I only did 2 peels but I've been getting other types of peels for awhile so that's probably why it worked so fast on my skin.