Light burn or bud rot

I think it is light burn because I found only on the cola that is closer to the light. Any help is welcomed.

Hard to tell, but my experience with light “burn” in flower like that was the top of the cola just looked white and bleached. Mold kinda looks like brown patches and smells obviously off.
If you have good airflow, it might be light burn. If you have bad airflow, might be mold. Good luck. And fwiw, I think adding the full image in the body makes it easier to zoom in properly.

light burn , tie her down