Can I take Rogaine for traction alopecia?

I read somewhere that Rogaine can help with traction alopecia (which I got due to hair extensions), and that once hair growth has returned, it can be safely stopped. Is this true? Or am I doomed to use Rogaine for the rest of my life? And a second question: can I use Rogaine only topically, or will its use impact the whole of my scalp? I'd like to use it only on the traction area and my temples, but I don't want the dread shed on the top of my scalp. Thank you!