I would say, without a doubt, please don't wait to have ti removed if you have a good vet. I tried to wait on my rat's last tumors and they became a nightmare to have removed because of the size. The earlier you can get them at the smallest size possible, the better off and quicker healing it will be!
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry