Could My Rogaine Use Have Swayed My Microscopic Scalp Exam?

I recently got my hair examined under the microscope to see if there were signs of thinning. The dermatologist informed me that everything looked fine. However, two months before I had noticed some thinning on the tip of my crown and I had used rogaine for two months around my head, crown and front too. Could the results of the test be because of rogaine, or if I had male pattern baldness, would the hairs show signs of that despite the use of rogaine?

Rogaine (minoxidil) may have had an impact on the new hair that grew out, and the lower inch of growth is what I would expect in the 2 month timeframe you mentioned. I would cut a long hair and see if the lower half is different than the upper half. That might answer your question.