white "dots" on my scalp that itch ...?

it started out as mild dandruff and now my scalp is always itchy and now i have white skin chunks that i can physically pick off... i made the mistake and tried to pick it all off to make it go away and it started to ooze this yellow sticky substance leaving the hair around my scalp sticky and almost greasy looking! its only in little patches on the crown of my head and the right and left side right beside the crown!

my moms a haridresser and thinks its psoriasis but i looked at pictures and my scalp doesnt look yellow or green and its not like a white patch its dots!

and its not left over hair products because my mom washed my hair to make sure and like i said shes a hair dresser so.. i think she knows how to wash hair hhahaha :P

but anyways i will be going to the doctors but i was wondering if anyone has experienced something like this or knows what it is before i go in!

thank you