Brown spots on blooms of Den. Green Lantern

[jocierk]

Can someone help me identify what is going on here? I got this Den. a few months back and it had two buds on it. As they got bigger I noticed a little spot on one of them but didnt think much of it. Now it has multiple flowers on it but every single one of them has little brown spots on it. The leave don't have the spots but it has lost the bottom few, they get yellow and dry up and fall off. If it wasn't for the spots I wouldn't even think twice about the leaves though. Anything I can do about this? Thanks!