Questins about microneedling

I have been using topical fin/min for about a year with fantastic results, but haven’t noticed my hairline improving. I’m wondering if microneedling will help, and have done some research that suggests it will. I’m confused about a few things:  – I’ve seen people mention .3mm daily and .5mm once a week. But the Dr. Pen dermapens I’m looking at don’t seem to specify size. How does this work? – Can I microneedle and use topical fin/min at the same time? I believe I can, but I want to be sure

Microneedling might bring back the frontal hairline. It is worth trying. Best, after doing the microneedling, hold off on the topical minoxidil and finasteride for at least an hour.