Rust spots on paph?

[kaymichelle0585]

Hi everyone!
I’m semi-new to orchids. I’ve only been going a little over a year and only have one paph. I’m sure this is probably a question that’s been asked before so I am so sorry if this is a repeat! I’ve searched all over online and in all my books and can’t find an answer.
My paph has 3 fans. Two are old and one is new growth since I’ve had it. The two old fans have “rust” like spots on them while the new fan is completely unaffected. As I’ve mentioned this is my only paph so I’m not familiar as to whether this is natural death of the old fans or an indication of a problem? The fact it hasn’t spread to the new fan or any nearby plant makes me confused if it is in fact a virus or pest. Thanks in advance for any input!