monti losing color?

[pap2]

ok so I have a Montipora (red plating) seems to be growing. top of tank.
but i have a white/brown spot that has showed up on top. could this be a problem?
this is not a new coral. also how do i post a pic on here?

 

[pap2]

i found out how to post pics.

 

[pap2]

here's all i have

 

[pap2]

yet 1 more pic