Gray Mold ?

Hey buddy. This simply looks like a stem has snapped or been cut off. The plant will create these brown spots as a sort of protection and heal up around. I can't give you any scientific terms, but this is the normal looks you get on such a spot. If the light brown stuff will spread, its most likely an infection. Maybe an insect or other animal snapped something off and contaminated the spot. So, as soon as the brown'ish stuff spreads, cut off the entire branch. If it doesn't, it wasn't mold! Its a bit hard to judge just by this picture. You got this! 😊

Hi friend, sorry to see this. If the one shown in the photo is the only spot, you could try a systemic fungicide applied locally with a brush, so as not to contaminate the whole plant. Copper sulfate would be effective and organic but unfortunately it is phytotoxic to marijuana. Before treating the affected area, it is best to clean the area well with a cloth dipped in a mild sodium hypochlorite solution. I hope it's just that. Good luck brother.