I think my kitten has a vaccine site sarcoma! !

Jessica,
Please do not wait until next week to see the vet. Call them, explain the situation and your fears, what you read, etc. thoroughly, and ask to be seen as soon as possible, ie immediately. My sense is that you need to know what you are dealing with and while there may be information on the Internet it is not – and never will be – in place of a thorough in person examination.
Can anyone else please provide advice on this?

OK, I’m trying to think out of the box here. I feel that even if you don’t as yet have the funds for a vet visit you should still call them. There may be rules about payment, but perhaps exceptions to rules can be made on a case by case basis and in your case, especially with you being pregnant, added stress is the last thing you need. As your vet gave the initial shots, then any reaction to the shots should be regarded as a follow-up and you should be seen and not charged for this. Or perhaps they can make an exception as “Good Samaritans” if this applies. If you adopted your pet from a shelter or humane society perhaps they could have a vet take a look at your kit. Or if there is a veterinary college in your area perhaps you could contact them. Or a TNR (trap/spay/neuter) program might have access to a vet who would take a look at your kit. I just think you need to be as clear and as upfront as possible. Asking for help is never wrong. And please, in no way are you being a bad mom, you had no way of knowing this would happen. I, too am sorry that you are going through this when all you want is the best for your kitten.

Hi. My cat Eko had a walnut sized lump in his shoulder that was a reaction to an injection, not cancerous. But the vet did draw fluid with a needle just to be sure. I would think with a kitten some sort of reaction is more likely than cancer, but I’m certainly no expert. I’d think cancer would take more time to form. Eko’s lump took a few weeks. Hope you are able to get him to the vet soon. Let us know how it goes.