I would say it's probably crohn's related. My doc told me sores or the weird white stuff on your tongue is a sign of indigestion problems, *yay for crohn's*.
I remember when I was having a super bad flare I got DOZENS...yes, dozens, of canker sores. I went to the doc and she looked in my mouth and said (and I quote): "Oh...my...god...oh...my...god". I also get geographic tongue with my crohn's. You can get med paste from the drug store without a presciption to help (mine was cause orabase or something) and try an antiseptic mouthwash to help future cankers from popping up.