You can see them in low magnification. I am concerned that you may have a HLA type which is basically a identification molecule type for immune cells, and these little creatures have honed in on that. Do not take this lightly. Your entire immune-system could be at risk. Treat the scalp with specially formulated shampoo for these. I have used boric acid on my scalp with immediate results, but others had no such luck.
They feed on hormones, so they might act up after sex, a stressful day, menstruation etc. Check for anything dust-like in appearance from pustules [just a precaution]. Also, if you have a magnifying glass, check your scalp debris for any dust which looks red, blue, or yellow. I'm sure that you just have demodex, but lets cover this at the beginning. Shroom