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If wood, then you can buy wood dough in various wood species matching colors at well as white and black - come in cans down to 1/2 pint so economic. Will probably need a coat of clear urethane or varnish to match the wall finish through.

If drywall, then use utility knife to trim away ravelled or shredded paper at the edges so there is none sticking up, then use spackle (or drywall compound if you have any) to repair the damage (commonly 2 coats needed with sanding in between to make perfectly flat), then touch up with matching paint. Use at least a 4" wide blade putty knife unless tight quarters demand narrower - easier to get smooth finish with wider blade. On the paint - most paint comes only in quart and larger cans (not too expensive - typically about $8-15), but some paint stores have pint cans and also 1 oz touchup paint bottles - like fingernaill polish size containers, for a few bucks each.