Hello,
I would suggest that you make an appointment with a dermatologist. That is the type of specialist best suited to exam your scalp, provide an accurate diagnosis and appropriate treatment plan.
You may have alopecia areata. Here is some info, let me know if you have questions:
http://www.aocd.org/skin/dermatologic_diseases/alopecia_areata.html
http://www.mayoclinic.com/health/hair-loss/DS00278
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