When a pimple or boil has been popped manually, but you are pretty certain that it will reappear because it isn't quite done, it is said to be fesculating.
I had this really gross zit on my back, and I popped it yesterday. It still feels kind of sore, so I am sure it is fesculating. It'll probably be twice as big as before tomorrow.
by Gross Monkey October 09, 2010