Hi,
Welcome to SimplyDiscus! Sorry you are having some issues here!
Question for you.. on those white dots , do they break open and leave a hole? We see these in Discus and its linked to water quality. Its bacterial in nature.. Usually the fish recovers fine but there are cases where the bacteria is a more pathogenic one and the fish can die. Im not suggesting that is whats happened here but its possible. Read this thread for more information
http://forum.simplydiscus.com/showth...very-long-read
On the mouth issue.. that could be from lip locking with other Altums.. but its also possible its lymphocystis.. I would look that up on the internet and see if its similar to what you have.
I would increase your water changes as well. Im surprised your water parameters are as good as they are with your water changes.. it may be your water quality has slipped to the point where the altums are just not happy and are open to infection. Generally though they look good except for the spot/sores.
Al