my partner had a swollen lymph node on the one side about 4 days into Iodine (16mg? 2 drops) and i was thinking it was because he had an impacted widsom tooth on that side that was infected.
once it was removed, the swelling went down a couple days later... but it's hard to say if that was the actual cause. if you have dental issues, maybe look into that too?
i had the little sweat pimples the first week on Iodine - on my chest, left side right under my collar bone, but they came and went within 2 days. maybe you're only seeing it now because of the dosage increase?