My rabbit has a lump

Question
We recently moved to Hacienda Heights CA right next to a nature reserve. Lately I noticed Foof (my rabbit) has two large lumps on his stomach with big black things in the middle. I popped them and sooooooo much thick cream colored
puss came out. The bigger bump was very hard and when I finally unclogged it a huge worm came out, it was about an inch long (I thought it was his intestence at first because it was so deep) I dont know what it was. I was thinking it
could have been a tick that burrowed in and turned into a worm or something along those lines. Anyways, today (3 days later) I took another look at him and they were filled with
puss again very thick and very deep (it was disgusting) and I cleaned out so much of it and there was a huge whole in his stomach afterwards and VERY deep and I noticed that about an inch away from the bumps, there are big bumps inside him like something is still in there maybe. I tried to push it up and out but it wont budge and I squeezed it hard inside him but it didn't pop or move, so I just poured alot of peroxide in the whole and came online to see if I can get help. What do you think the big bump is inside and what should I do? We put advantage flea and tick for cats on him 3 days ago so he shouldn't get anymore ticks or fleas but I'm freaking out about the bumps inside him. I read about myiasis or maggot infestation and the worm did look like a maggot
Please email me back at identicalyunique@yahoo.com
Thank You
Lindsey

Answer
You keep the rabbit outside?  This sounds a lot like the cuterebra fly.  There is info about this at http://botfly.ifas.ufl.edu/links/links1.htm#cutrlinks

In general, you don't want to remove them yourself because if the larvae die, they release toxins that can kill the rabbit.

I would take him to a vet to have the rest of them removed, and consider moving him inside for the rest of the summer.

Flea medication will do nothing for these critters, they are a type of fly.

Kim