I think that these "pustule-like small spots" are filled with lymph coming from the follicle.
I think there is no lymph in them. They appear almost flat in real life (that's why I referred to them as "pustule-LIKE" and not "pustules"). Like little skin marks where the insertions were. Maybe I used the wrong term.
You can read the following topic for some explanations: "Excessive Lymph During Treatment?"
I'm familiar with that topic and while there indeed is some plasma fluid coming out during my treatments on the upper lip, the leaking usually stops as soon as I get back home (and it's not that excessive, after all). Skin surface on the presented photo looks kind of wet and shiny because it's also covered with sun screen.