Rogaine 5% and non MPB-affected scalp

Was just wondering: let's say i'm concerned that i'm balding so i talk to my doc then the derm who tells me that she's unsure on the matter, as there is no visiable sign of MPB, but she points out that i should use rogaine if i'm concerned.

So what if i'm NOT experiencing any hairloss/MPB will rogaine have a negative effect on a healthy non baldnes-afftected scalp? :confused:

Hmm seems to be a pretty hard question to answer I guess?