You could write a page for just modifying that one profile field. However, I'm not sure that you may enter html into a profile field and have it parsed as html, so if your goal is to have html, then I don't think profile fields will do it.
vB suggests that you don't allow users to use html on the site because of the malicious things they could do. You'll have to be careful in writing this so that they can't do anything like that.
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