I was doing a "pre-flight" check when I noticed something in the engine that doesn't look right. I am not a mechanic so my descriptions may, though not intentionally, be humorous to you. This is a picture of the left side of the manifold(?). Notice the protrusions just above the center of the picture. The left one is smooth, while the right one is peeling.
Here is a closeup of the one that is peeling.
The metal under the peeled plastic(?) seems to be fine. What is this that is peeling? Is it okay? Is there something I can/should put on it to make it neater?