I just started to dermaroll myself and have a couple of questions too (didn't think it warranted its own topic):
1) Do you have to draw blood for it to be effective? I use the 1.0 mm length pins and press with a good amount of force and that stuff hurts like a b**ch...yet it doesn't draw blood. Not sure if I'd be able to tolerate pressing much harder anyway.
2) Has dermarolling ever been shown (anecdotally or otherwise) to be efficacious even in the absence of minoxidil or other agents? I don't use anything else, which is why I ask.
So far I've only DR'ed one time, so any help is appreciated. Thanks.