Help identify this please

[soaringfast]

This started showing up in the last few days on just a few of my girls. It looks like it's spreading.
FUngus? Virus?

 

[joeca1i]

any plant pics?If your growing in a soil,or mix,just add some garden lime and water them with the waterhose aka (tap water).Check for bugs under the leaves or in the medium.

 

[Fat Freddy]

looks like a lack of cal or iron.
Check this site:

http://www.growery.org/2991/Diagnosis