I've been off the Antibiotics and steroids for eight years now, so I'm not the best one to comment on much of your post. But pustules are nasty and I remember them very well.
Pustules are like a big pimple, a zit. They are red, they are raised, they are painful, they burst, they weep pus and lymph, they dry up and matt what's left of your hair - and then they scar. I dont miss them at all.
Anyway - this is just a friendly welcome to our community. Keep in touch.