Hi, could anyone give me any advice. About 10 years ago there was a small bald patch on my scalp, my hairdresser found it. My mum said it was probably because I had scratched a chicken-pox, I didn't think anymore of it but the hair never grew back.
Then about 2 years ago I was in the shower, my hair was really itchy and dry and I was scratching away and the water was quite hot! As I was scratching away I looked down to see a lot of hair in the bath.

My hair hasn't grown back, so I now have three bald spots close together where there is no hair at all.
I must point out that I have good hair growth, my hair isn't thinning at all, it's just three fairly small bald spots that almost make up one big bald patch. These bald patches are on the top of my head and near the middle.
I went to the doctors and I think they said I had scalp psoriasis. But I thought that scalp psoriasis caused your hair to thin, not bald patches where the hair doesn't grow back? My hair is still itchy and I'm worried I will get new bald spots. If I get anymore bald spots it will really start to notice, I can't have my hair too short now. I still wake up with loads of single hairs on my pillow and bed.
What made my hair fall out in the shower? Was it because the water was to hot or because I was scratching to hard? Why hasn't my hair grown back? I would appreciate any advice please!