Hi Janet:
Hmm...that doesn't sound good! Bark is obviously an important physical barrier that helps protect the tree and when that physical barrier is compromised, the tree can become stressed and subject to decline or even mortality.
Therefore, feel free to send some high-resolution digital photographs to your local UI Extension office for evaluation by their local horticulturist or Master Gardener volunteers:
https://extension.illinois.edu/global/where-we-serve
Best of luck!