White spot on lobophyllia

[lakes1985]

Hi I bought a lobophyllia coral a week ago in my LFS and and a white spot has formed on the surface after a few days, it's gotten slightly bigger. I also bought a favia coral which I'm not to sure looks healthy either. I'm only 6 months into the hobby so I don't know a lot about anything yet,still learning. Can anybody tell me if this is anything to worry about please? Il attach photos

 

[lakes1985]

Lobo

 

[lakes1985]

Favia sorry about the quality of the pics

 

[SBlisters]

Did you get an answer on this? I suddenly have a black spot on mine