A lot of Lo's can have contact allergies...and for some, depending on the severity, they just ignore it. My dd has a TON of contact allergies....I honestly could not list them all....Before a year, I would stop giving anything that broke her out and stick to tried and true. Now, it's so hit and miss, that as long as it's just contact, and not manifesting it any other way, I let her have it. One day she will eat blueberry yoghurt and not a mark, the next she's got patches whereever it's touched. And it happens to SO many foods. DS had it a bit, but not as bad as DD.
I would double check with your doc about his/her policy just to ease your mind.