Both of my sisters have this camera and one of them was affected and rather than send it in and be without a camera for a while, she persisted and ended up getting a new one instead. I thought I would pass the info along in case anyone else has the camera also. Quite a unique recall. Here are the details from Engadget:
We've covered our fair share of product recalls over the years, but this one almost certainly takes the cake when looking at pure zaniness. Canon has recalled its EOS Rebel T4i -- some 68,200 units -- "due to a risk of allergic reaction." You read that right. As the story goes, a chemical used in the camera's rubber grips "can result in a reaction that changes the grips from black to white and poses a risk of skin irritation to the consumer," and while the company has only received a single report of a consumer developing a "minor rash" after contact, that's obviously enough to issue to recall. It involves T4i units with a 12-digit serial number that contain a second digit that is a "3" or "4" and a sixth digit that is a "1." If that's you, you're advised to stop using the camera and ping Canon USA to have replacement rubber grips installed free of charge. Specifically, you can ring 855-902-3277 and be prepared to be placed on hold for the better part of your adult life.