Don't panic--If you still have the larvae, put it in a plastic bag and take it with you to the vet. This isn't life threatening. Since you say he is indoors ONLY, it makes it a little hard to think this is actually what I originally said, although mosquitoes do get in though open windows and doors and this is how the larvae is transmitted. I think the vet needs to see this and possible give him antibiotics to prevent an infection. When you get back, let me know what he says. He will probably want to remove the other object as well.....as NOW from what you said, I thinking this is something else, and I am truly wondering what is going on with your cat! Again, I don't think it's anything life threatening, but definitely something that needs to be seen.
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Lori McLaughlin
Your veterinarian should ALWAYS be consulted first and foremost when your pet's welfare is at stake.