A hot pepper plant (either a Trinidad Moruga Scorpion or Ghost Pepper) that I've recently (couple of weeks to a month ago) moved outdoors (weather above 8-10°C @ night) started showing some weird black/gray fuzz on new growth.
These "marks" can be seen both on the top of the leaves, next to their stem, running along the veins, and on the underside, where it looks more like a fuzz. As mentioned, this is affecting new growth, and it's present on all the new leaves to a certain extent.
The concerning part is that quite a lot of the new buds that started growing recently are randomly falling off, without any clear signs of damage (some are wilted, and "dry" off, but others just fall, completely plump and seemingly unharmed).
Any ideas what the black/gray fuzz might be, how to get rid of it (in case it's harmful), and if it has anything to do with the flowers falling off?
I've added a couple of photos of a healthy looking leaf from the top and bottom:
When taking the healthy images, I've also noticed these bugs on the bottom of another leaf:
Can these be the cause?