I personally take Lugol's and have had some miracles with it. For candida on my face I would soak a Bounty paper towel in Colloidal Silver and put it on my face several times a day for at least 6-10 minutes. Iodine can be taken internally, as it is also effective against candida.
This is a link to the FAQs at the other Iodine forum. Read until you think you have a good understanding of the subject. Then whatever questions you have, post them.