Pinecone scales is not a good sign it is generally called dropsy but can be caused by any number of things, I have managed to "treat" the fish before using antibiotics and I say "treat" because the fish usually don't last long due to internal damage.. Antibiotics are a guess because without knowing exactly what is causing it you have no idea what to treat it with so you could be wasting your time, or the swelling could be caused by an organ failure etc which is fatal.
Best bet would be to move the fish to another tank or bucket etc and lots of water changes maybe some salt and furan if you have some, but if it is dropsy I wouldn't hold much hope for the fishes recovery sorry to say