it's referred to as a sun spot.

I have noticed them on cigars from time to time. I actually had a cigar this weekend that had one.

They are usually about 3mm in size or so and have a dull gold color.

I wouldn't worry about them. I don't know what causes them but seeing that tobacco is an organic it could be caused by just about anything. Maybe a tiny injury to the leaf. Some sort of naturally occuring fungus occured before harvest or maybe a bug bite or maybe some hot babes were in the field using gold body paint before harvesting the tobacco nude and a little splashed on the tobacco.

To my knowledge it is NOT an indication of any post rolling bug problem. Relax.