I have had this issue of thinning sides and now the back of my head as well. I'm not sure what exactly is causing it. The top of my head is not as thin as the sides and the back of my head though. I also have these weird pimples on my scalp that are quite itchy. I have had Alopecia Areata before which I've gotten Steroid shots for. I am on Finasteride for 6 months now. My hair sheds quite a bit in the shower and during the day just running my hand through it. Help me please.