Zeo,
I am no doctor. Sorry. But I will say this will a little confience: if you skin heals back to normal and nothing adverse (like lost of tissue or your skin stays inflammed long term), then I don't see any reason to stop using the roller. I mean, you have been using longer length for months now and you have not mention any bad thing about that, right? How is your scar management going? Do you see result? If you do, I take that as the benefits out weights the negatives (redness). If you feel very uncomfortable after rolling and all that redness is bothering you, I think you can take a ibuprofen or aspirin. I am certain those OTC drug can calm the redness down. Now, you can say, what about OTC 1% hydrocortisone. Well, I don't think it is a good idea at all to put it on needled wounds because it probably break down your collagen faster than on intact skin while it may give you relief on redness and itchiness. Though, I am not sure if they would interfere with that acute inflammatory reponse that is necessary for skin remodelling Sarah mention somewhere (or am I wrong. lol. I don't remember). You may want to wait for Sarah on this one. But I don't think it hurt to take an ibuprofen to calm the redness. Just saying.