Diagnosed with FPHL - looking for feedback on minoxidil spot using and shedding

For female pattern hair loss I typically recommend minoxidil to the affected areas along with intermittent platelet-rich plasma (PRP) injections to the affected areas of the scalp. Both of these treatments decrease the amount of hair loss or shedding. Best of luck!

Minoxidil applied the frontal area can sometimes cause diffuse shedding, yes. That shedding is a TE and likely will recover over time in most (but not all) cases. As for your other question, if you have early AGA and see lots of loss at the back it’s more likely that loss at the back is coming from a TE than a diffuse AGA form. Of course, a good examination by an experienced clinician can sort that out. If it’s coming from a TE, the treatment is to fix the TE trigger rather than put minoxidil there.