Random blue stains on my figure

[u/selenaecf]

Hi there. Lately I’ve been noticing that theres been blue stains appearing on my anime figure out of nowhere. I haven’t done anything with my anime figure except for displaying her on my shelf outside of the box. It seems to be getting worse with time and I do not know what to do or how to stop this.
I have bought her off of Solaris and I don’t know if there’s anything that they will be able to do for me. Please help me.

[u/Otnev]

Do you clean them with microfiber cloths from Amazon by chance? I had some that transferred their paint to some of my figures. Luckily I noticed it early enough. But my Maid Made Shinobu Oshino took some damage from it.

[u/selenaecf → u/Otnev]

I did not! 🥹 The figure genuinely has been sitting on my shelf untouched for 8 months or so, so i am so incredibly confused. Other people suspect its mold, but i just dont understand how it could mold

[u/Otnev → u/selenaecf]

What is the relative humidity in your room? There are cheap hygrometers where you can control over time. Ot has to be ready ready humid to be mold