it is mold, so you have a few options, option 1 keep growing and when you harvest you need to make hash as that will get washed away and you still will have something to smoke on, you can make hash several ways from ice bucket method, to using alcohol and lightly heating to evaporate alcohol, leaving a nice golden resin , you can also use a dry ice method, just grab a few hash bags, dry ice is cheap and if you do a google search you probably can find a store near you and under 20 bucks you could grab maybe 3-4 lbs, this is by far the easiest way as dry ice is used for shipping frozen stuff. last option cut down and sort through the buds that are not affected, you will really have to look cause you can not smoke any with mold, a pretty risky option. and last resort,
you can try to wash your weed, but may not work if your area is humid since you already have mold. sucks but if i was you i would make the dry ice hash. atleast i would be able to still get some thing