hello Vathsala .
if you are losing hair in coin shaped patch then u are suffering from alopecia areata
alopecia areata is an autoimmune disease
which needs to be treated
and as well dandruff
needs to be treated as its an infection and it might aggravate the condition, will suggest you to start with Homoeopathic medicnes as its very safe ,natural and effctive and if u start your tretament at the earliest u can expect full recovery through homoeopathy , for more info u can write down at (firstname.lastname@example.org)