I agree with turning them out. When they have an abscess busting through, you can see pus and discharge come out with every step, and this is exactly what it needs. You can hear the crud squishing out, and that movement helps greatly. Of course, epson salts, an ichthammol draw, and/or poultice wrap are all good things do use with an abscess. I wouldn't have a vet or farrier dig on it, or interfere, as that's asking for trouble and can turn into a big mess. It's best to let it run it's course. Also, we don't use antibiotics when a horse turns up with an abscess, as it's best not to suppress the infection. Better to come to a head and then you can help it along with draws, or soaks, or poultice. We have some areas on the ranch that are rocky, so we get about one horse a year turn up with one. I wrap it mostly with ichthammol before, and right after it comes thru. Then when it's come thru, I take off the wrap and turn them out, but soak it 1-2 times a day.