My dogs mouth swollen (border collie)

I put some hartz on my dog before, but this time I think he licked some off of him. I woke up this morning to find that his mouth/cheeks were swollen! I’m not taking him to the vet! I did wash the area it was applied with soup and the swelling has gone down a bit. I also have been giving him ice cubes. I love my dog like my family and he will NEVER be given this stuff again!