minoxidil reduces collagen but estrogen increases it. I can only speak for myself but I haven't gotten those sides from minoxidil even when I took 10mg a day.
Most mtfs who regrow hair include minoxidil in thier regimen, many men use minoxidil too but don't usually respond miraculously like they do. Some have regrown lots of hair with Hrt alone but after it seems to max out regrew a little more after adding minoxidil.
In my opinion, estradiol plugs the radio back in and minoxidil turns up the volume switch. while anti-androgens keep androgens away from the radio.
It's risky, but there's only one way to find out.. Don't stop it all at once though, taper down.
I took 10mg minoxidil a day for a long while, it made me get too much hair on my back and arms, etc. I reduced it to 10mg once every other day and it hasn't hurt my scalp hair and now I have alot less hypertrichosis than when i took everyday.
but not sure if you could do the same because I'm on a full Hrt.
It is a very localized problem. breasts have high aromatase and scalp has high 5ar. That's why there's guys with man boobs and baldness