Help, rabbit have a tumor ?

[Scorpio]

My 1year old rabbit have a big lump like 50 cent Under the body ;(
What sld I do? Is any vet that good , what the price around like?
He do ok ,Sld I wait and see ?

[ruu]

Is the lump growing bigger? I used to have a dog which also have a lump underneath the body which is like a fist size, but it is not tumor. For your info. The vet cost is ard 800. I dont know if the cost is same for rabbit