Why haven't my hair grown back?

[superfangs]

Few Months ago i tooken griseofulvin for 8 weeks because i had tinea capitis and i had a bald patch it was really itchy now it never itches no more im getting scared its been 6+ months and my hair has not grown please tell me its not permanent here is a pic

http://i255.photobucket.com/albums/hh135/rayman100/IMG_1242_zps7dbeff93.jpg