The doctor will remove the eggs when a male cat is sterilized. There will be traces of the previous eggs when it is just finished. After a period of recovery, the owner can pinch the remaining egg skin with his hands. Because the doctor only removes the egg yolk during sterilization, the egg skin is still there. When it becomes swollen after the operation, it looks like a complete egg, but it is actually just a layer of foreskin, which will slowly shrink and disappear after a few months. .