Cancer, or ink?

[HavACrumpet452]

I think its just sharpie. But that's just me.  I have a huge collection and I've yet to see blue-green cancer. I'm willing to bet the sun would fade those out. And for the record, I've yet to see anybody find mold in any of the typical pony afflictions when looking under a microscope. IMHO, surface mold existing on something on the pony is the only mold a pony is going to get. There is no mold in these so called cancer spots. Bacteria yes, mold no.
The sad part is I think a lot of G1s get baited or destroyed because people think they have cancer.

[babystarz]

Cancer = ather type of mold damage in the form of brownish/greyish/greenish/blackish/insert-color-variant-here spot-like markings that appear throughout the pony's body, usually with a darker "dot" in the middle of the spot.

Actually, there is evidence to indicate it's not mold, but bacteria burrowing into a spot and creating waste.

[pranceatron]

I agree that it looks like marker - those can also leave a dark mark in the centre and the dye bleeds into the surrounding plastic & radiates out from the original spot. I've never seen organic green spots like that on a pony, esp. with the relatively non-circular shape.

[lovesbabysquirmy]

Try sunfading - I have a feeling those spots are ink that has soaked into the vinyl.  I agree with HavACrumpet452 , I've never seen blue/green cancer. 

[Rainbowjuice]

Pythia fair point! We need a new term for this ailment!

I just can't call it cancer in good confidence.
Hmm....

[Ginger]

Try sunfading - I have a feeling those spots are ink that has soaked into the vinyl.  I agree with HavACrumpet452 , I've never seen blue/green cancer. 

I agree, this is what I thought too. Boiling would be the last thing I'd try, but that's just me. I'd carefully use something like Mr. clean magic eraser first (keeping away from all paint) and see if that removes some of it. If not, sun fading would be next.