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Hello and thank you for using this site to help you. You will need to keep an eye on it especially if the dog can reach it to lick at it as the mouth holds a lot of bacteria. If the dog cannot reach it, just keep it clean daily and apply a triple antibiotic ointment on it until it heals. If it swells, turn red or feels warm then there is likely an infection brewing and that should be checked by your vet.
If the dog can reach it to lick it then use an Elizabethan collar, ( cone) which will prevent the dog from reaching the area while it heals.