White calyx? White buds? Rot?

[BobChronic6505]

I've seen that happen.. its from the rate of photosynthesis. it's too slow from lack of light. This is not uncommon. I had some really dense plants that do that. It happens more so under LED. Anywhere there isn't enough light.

Are these spots more susceptible to developing molds?

 

[Hammerhead]

It would need more than the lack of light to grow mold. Moisture, temp , Air flow would be something to look out for. Lack of light alone would not be an issue.

 

[Nico Farmer]

It would need more than the lack of light to grow mold. Moisture, temp , Air flow would be something to look out for. Lack of light alone would not be an issue.

Sure; look for air flow, air humidity to avoid mold.