Recently moved to new house and found some black discoloration while poking around in the attic. Is this mold? I did notice it gets pretty hot up there during summer. There is ridge vent and gable fan to vent it. I was recommended by the inspector to install soffit vents for better ventilation. Reading the inspectors note, he only mention that this was dark discoloration due to humidity and could lead to mold but not exactly say this was mold. Can someone tell me if this is mold? if so, how serious? Should i get someone to come and look at asap?