Do what the other posters are saying!
Document, Document, Document!
Take pictures of the iron, your fabric, your hand. Write down what you were doing at the time.
Along with reporting this to Rowenta, laynak's suggestion to report to a Consumer Protection Agency is EXCELLENT!
From just reading the posts on here, a lot of irons seem to have issues that could - and have - turned into safety hazards. If 'they' don't know about the problem(s), 'they' can't do anything about them. And I doubt that very many members of that agency are reading this board - or if they are - that they are tracking irons.
UL - Underwriters Laboratories - might be another place to tell about your experience.