Hey darbyog,
this is definitely no typical thing and unlike any other problem I've seen before.
My guess is some strange type of fungus/mold.
You should get rid off that bud or - for scientifical reasons - take the plant out of your tent and let it grow out outdoors, to see what happens with the black spot.
The small flies and insects are normal if you grow organically and even if you don't - with high temps there will be some stuff crawling/flying around. Thats no biggie!