Since they are only on your scalp, I'm thinking it's not bromide zits. Looks like the Iodine may have stirred up some parasites in your scalp and run them out. Better out than in, as we parasite warriors say. I had that happen last time I took Kroeger's Wormwood combo, and they also broke out on my face, but only one one side. Left strange scars -- long with holes in them.
Do you have those anywhere else on your body? Have you used anything besides the iodine? How much are you using?
Forgive me if this is common knowledge. I'm new here.