Hello, My name is Hardik Panchal and my age is 27, height is 5''8', and weight is 75. since last 3 months my hair lossed significantly, and in scalp there is round spot where all hair has lost. We call it in GUJARATI is "Undri", don't know in english. can you tell me for what reason it appears and what it the treatment?? last year also I had this kind of situation and dr told me that it is one type of skin infection.