It seems to have been an abscess. Your cat will probably need a course of antibiotic tablets, that is if you can manage to give them to the cat. It is usually one morning and one evening, If you feel you can't manage to get the cat to take them, tell the vet and he/she can give the cat an injection of a long lasting antibiotic. Although you have cleaned up the site, infection could still be there which would make the wound fill up again, or weep. One of my cats had the same thing, and in addition to the antibiotics, I had to keep the open wound clean, just with warm water and lint, and apply an antibiotic powder to assist the healing which took just over a week. It is highly unlikely that the wound would be stitched. I shouldn't think it would cost more than �25 to �30, depending of course on the vet surgery you use. Hope all goes well tomorrow. A report on puss's progress would be nice. Schutz.