I've heard others talk of iodine allergies -- however, it's not really possible to be "allergic" to an element that's essential for life; at least not in the traditional meaning of the word. Real allergies are usually an immune system reaction to proteins, such as those in fish or nuts.
Having said that, iodine can definitely be an irritant, and initial supplementation can cause the body to release bromine, fluorine and certain metals, which are also irritants. The result can be a skin rash or possibly lung irritation. It might look and feel like an allergy, but more often it's probably a toxic reaction of some type.
If you apply iodine to the skin, you can help minimize the irritation effect by avoiding areas with skin creases, such as your inner elbows or inner knees. Maximizing air exposure seems to help dilute any potential toxic effects.
Regarding dyes, keep in mind that they usually contain much more than just elemental or ionic iodine. Although some people seem to be more sensitive to iodine than others, systemic reactions to radiological dyes are usually also toxic reactions, caused by things like overloading the kidneys.
Here's a link to a page with one MDs opinion about iodine dyes and related allergies:
http://www.wdxcyber.com/ngen22.htm
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