That depends. What was the wall made of? I'm assuming drywall since you pulled some off. A picture really does help. If it is just drywall and it is in an area that isn't exposed to water then a top coat of drywall compound should work fine. I'm not sure if that is exactly what it is called but I'm sure some drywall experts will be along to correct me.
Please post a picture when you can though.
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