With Spot's first one, I freaked out. I had just gotten home at 10 pm or midnight or some late time after the normal vet was closed. I went to pick him up, and my hand was suddenly covered in blood and goo. I didn't even know he had one prior to it bursting on my hand. The ER vet reassured me that it was "just" an abscess and that he didn't need to come in until morning. Spot had only been with me for a week or two at that point, and we later learned that he couldn't take most antibiotics. He had recurring abscesses on his head that we had to lance and drain--we had lots of time in the bathroom with warm compresses on his head.
Any how, I'm glad that Peaches' problem wasn't too serious and is easily treated.