There is no alcohol in Listerine so it does not burn, and it evaporates so it disinfects and dries the hot spot. Be sure to use the original gold Listerine because the other colors can have sugar, etc. in them.
By "on time" how soon is that? Bentley has a hot spot on the inside of his leg that I've been treating with Neo Predef w/Tet for about a week now. It's not any bigger but it's not getting better. I was thinking about trying the Listerine.I use the no name brand - like CVS's. Works great, if you catch the hot spot on time.