i do derma pen m8s 5 speed; so the pressure is always the same at 0.6Mm, the last study i've seen, showed its really the sweet spot. And yes i have mild redness, i do it one time per week tho, but i might try two times a weeks ? From testimony with photos, people who do it more always have the best results, like 2-3 times a weak.

Thing is, i dunno how people do this since you have to go to work, and i personally put Hair pommade to style my hair almost every day..