I haven't read all of the ansers, so someone else may have come up with this solution, but my thought is to take another part of the same block that has some of that creamy-white color in it, ravel a couple of the threads, and after putting a little spot of fusible stablizer on the back (gently work it in), thread that creamy-white thread and 'darn' the torn area. You will be using the exact same thread as in the fabric. In theory, it works. The fusible stablizer on the back will help to re-inforce it.
Let us know what worked for you.