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Varun ,this condition is called ALOPECIA AREATA
.This is a autoimmune condition where in your own body cells start destroying your hair follicles ,there by leading to coin shaped hair less patches .If the condition is very active then other hairy parts of the body may also gets involved like eyebrows,chest ,armpits etc.So keep a watch of it.
There are times it is associated with thyroid
Treatment consists of intralesional injection ,oral steroids(if spreading) ,topical sensitizers ,topical minoxidil
etc.A combination of all this is a must.
So,consult a dermatologist
who can start your treatment asap.