Hi Kiera,
It can, but it takes months to years. I have a pronounced widows peak and thinning on the top and crown of my head. I have been on finasteride, spironolactone, and estradiol for about seven months. I have seen development of vellus hair at my hairline where there was no hair at all, but it is still very fine. I don't see any scalp at the crown of my head anymore, either. It is encouraging.
My natural hair is shoulder length, but my hairline is a dead giveaway. I ended up buying a good quality hairpiece last weekend, and it really helps. I am actually wearing it in my avatar. I deliberately left a little tuft of gray out to make it look more natural, but I could completely hide it if I wanted to.
With kindness,
Terri