Whats on My YSM?

I have been watching a spot on my female ysm clown. It is right below her eye and near her mouth. There is a white mossiness look to it. We left for the weekend and now it is on her mounth top and botton and a small spot on her tail. I really do not want to lose her now. She is the one fish that I got to keep from the trip to shreveport.
What do I do now? the bump is getting bigger and the white stuff is spreading. Any help would be great !!! TIA Breezy

ps Serk will be adding pics.
 
Thanks Matt
I hope she gets better soon. I don't want it to spread to the other fish. This is just my luck I guess. It seems like nothing has gone smoothly with the tank. Breezy
 
She is looking worst today. The white stuff is all around her eye and she is huffing. She is hiding up under a barnacle near her Sabea. I did a water change and added fresh RO water too. I think that might have had her get worst. I matched the salt to the tank. After the water change I added 5 gallons of Ro to bring the salt level down just a bit. Thanks everyone for the advice. Breezy
 
I have two saddle back clowns and one of them started to get something that looks alot like what you have on yours. What i've read is that some clowns have a natural parasite that lives in them and when they get stressed it starts to protrude like that. I put mine in a QT tank and used copper-free and it cleared up in a couple of days.
 
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