Hi I am 25 years since my childhood I have white hairs. So when I get too much white hair I applied black colour to hairs. But since from last 4-5 years I got itching, dandruff and hair falls and when I got bald my scalp got red like allergy so when I consulted doctor he gave treatment with some medicine 1) ketocozonal shampoo thrice a week 2) kevon lotion every day night 3) alcros 200 mg twice a day 4) azimore at night 5) lecope daily night. After taking these course my problem was not solved. It is still there. So I was tensed whether it is psoriasis. So kindly me tell me what type of allergy it is.