I doesn't look like mold to me, I wouldn't worry about it.
I keep my cigars in coolers in my finished basement and during the summer months, I keep them right out in the open because the humidity in the whole room runs about 65%.
One year, we had some nasty, muggy weather and the RH in my basement was 90% :0 and I had some cigars out in the open and they all got pretty moldy.
I immediately went to Home Cheapo and tried to buy a
dehumidifier but gee, they were sold out, go figure.

It seemed that NO ONE had
dehumidifiers for sale anywhere in all of New England that hot, muggy summer. I got lucky a few days later and found one and have been using it ever since.
I just brushed the mold off of the cigars and they were fine.