I think the white specs are escaping larvae.
Bleach will not kill them as I have tried. Bleach is also hard on you and your cloths. I soak ALL my cloths in a solutions of 1 once of permethrin to 5 gallons of hot water before I wash them. This does kill everything.
If you apply cream to your paraneal area all that does is hide the parasites
from you and allow them to dig back into your skin.
Use a tape lint roller on your underwear every time you go to the bathroom. I also use baby wipes to make sure I get most of them off of me.
Use a lint roller on your sheets every day to pick up the "specs" that have escaped your cloths. You will be shocked about how many there are in the bed.
I am always devastated when I see these in my underwear but keep repeating to myself, "Better out than in."