a fever might develop but it is not the case every time. There are two different kinds of abscess and one is more encapsulated and you do not develop a high fever..I had the same happen to my ass.They had to cut mine out too. Now I have a chunk missing on my ass. If it gets bad like mine did. you will develop a fever. Thats when you know it is in the blood stream and can spread. Go immediately to the doctor then. I had a fever after I left mine swollen and red for about 1 week. I was hoping it would clear up on its own. Redness, swelling, and then cellulitis. The skin also had a weird texture to it, almost like I had goose pimples all of the time.
Ive also waited in my case for fever but it never came so ive shrugged it off which was a huge mistake