After i remove the mirror from my bathroom wall will i have to replace the wall because of the damage done?

its a flat mirror glued to the wall. i want to remove it and i've figured out how to do that. but d.i.y. suggested that there might be terrible damage done to the wall and that it may need replacing. i don't have the skills or desire to do that. should i just leave well enough alone? i really want to hang... show more its a flat mirror glued to the wall. i want to remove it and i've figured out how to do that. but d.i.y. suggested that there might be terrible damage done to the wall and that it may need replacing. i don't have the skills or desire to do that. should i just leave well enough alone? i really want to hang nice mirrors over the sinks but its not worth having to replace walls. thank you.
Update: its drywall. its the entire wall above the sink and i'd like to hang a smaller mirror. mayby i could do beadboard on the wall if there is a lot of damage.
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