My dermatologist just told me I should go on Minoxidil; however I was reading the box for the instructions and it says not to use it if you are experiencing frontal thinning and only to use it if you have thinning on the vertex. Can you use it for frontal thinning? My hair is fine everywhere but in the front, and that was my intention on using it..will it still work, or should I not even bother if it says not to use it for frontal thinning?