Hello, Laura. I think I have good news for you but be aware that I am obviously guessing from your comments:
1. The bumps are nothing more than a combination of cosmetic swellings from an early
spring & the feeding of an eriophyid mite. The bumps themselves are referred to as maple bladder galls. They start green, turn pink/red and then black. It does not harm the
tree so no treatment is necessary. By the way, this also happens on red maples.
2. The green on the bark could be lichen, moss or algae which do not necessarily harm the
trees either. It could be caused by lots of rainfall, humidity where you live, irrigation sprayed on the trunks and/or not enough sun hitting those parts of the trunks.
I hope this helps,
Luis