Help!

I Need help! My rabbit has been growing a bump on his leg since January and the bump has been growing since then but today I checked his leg and his bump is really black and big ... I don't know what to do . I'm really scared , I have a feeling it's a tumor but no that sure... HELP!

The Black Bump On His Leg

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All you can do I think, is go to the vet. Try to find a vet that is experienced with rabbits.

What your rabbit has looks a lot like this. If you read it they decided not to put the rabbit to sleep and treated it. The black lump eventually came off. http://www.asiahomes.com/singaporetpvet/rabbit/0412rabbit_jawtumour.htm

There's a number of things it could be. I've found that even the healthiest of bunnies can develop cysts and treatment is often very manageable. It could also be a bite or a tumor. Worst case scenario is myxomatosis but there are many other symptoms along with big sores. If it isn't a prevalent virus in your region than I'd say that's not the case.
I say visit your vet pronto. The sooner you figure out what it is the more effective any possible treatments will be.
Best wishes to you and your bun.

You must go your bunny to the vet