vitiligo and iodine

I've been using 50mg Lugols for 4 months. I think i have vitiligo, mostly on legs, and this has developed recently. I have hypothyroidism, but have been taking Armour for 4 months, and did not have this condition before.
Could the Iodine have caused a mineral imbalance? I take 3G of C, Magnesium and lots of other stuff. Or, could it be the Iodine bringing this out, as it cleanses the system. Do i carry on with the iodine? I know a lot of people with hypo get this but why now and not before i got treatment. I've been reading a lot of stuff, but there seems to be so many theories, low stomach acid, b vits, low copper etc. Can Iodine cause low copper?
Any imput appreciated
Thanks
Sarah