I am so worried about my kitten, he is about 11 weeks old and has been throwing up lately. Today I found a huge spot where he had thrown up and there were 2 worms about 3 inches long, looking like round worms. I haven't seen any in his poop at all. I check him out and he seemed okay but when he walked away I noticed his butt was very pink, I took a closer look an it is a bit swollen as well and looks closed up. It wasn't like this yesterday or this morning, has anyone seen this before?