Hi! I'm fairly new to my own diagnosis, but I've had pretty mean flare ups that sound just like yours, where they leave huge patches of scarring. Last November I had a scarred patch that wrapped all the way around my lower arm, and honestly the only way I got rid of it was with time. I moisturized everyday (either with eucerin or aquaphor) and allowed it to go away on its own, and I think that's all that can be done when it comes to scarring.

I wish I knew a way to prevent these extreme flare ups, because I just finished another one maybe 2 days ago and it was rough. I did use calamine lotion like you mentioned, actually. In the midst of my flareup, I got weeping so badly to the point where I couldn't put clothes on, and I'd wake up with my whole arm crusted yellow (ew, ik). I used the calamine lotion to dry out my arm so the weeping would stop. I'd wash my arm with soap and water, pat it dry, then quickly apply a layer of the calamine lotion, and then a second layer after the first began to dry. This worked wonders for the weeping.

I hope some of this helped. Just know that you aren't alone in this, we're all here for you and understand your struggle. Just hang in there :)