Dude Im so Baked...It looks like a bird on your plant. But yeah its mold....Sorry to hear that...now stop crying and start a new one....sterilize the room, check your others if you have some. Spider mites are a bitch. Im sure more experienced growers have some valuble tips on mold....Did you spray the leaves with water? That could cause mold...your temp?? Yeah that could do it too... Your RH is rather essential in a grow. If you have that problem with mold more than once I'd consider a better ventilation system or a Co2 setup...IMO but yeah...im sure someone will come along with better tips.