my name is yahya am from lahore , pakistam.my age is 26 years.i am suffering from this disease from 15 years now.i have visited many dermatologists but of no use. i have used salicyclic acid,selun blue,ketraconazole shampoos,i have also used hydrozol cream,i have used itraconazole tablets for 14 days.but after a certain period of time thick scales again came and became my hairs dull and dry.what should i do?please guide me.regards,yahya