For the past month now ive had whitish scabs of the back of my head, it started small but its roughly 2 inches round now, it itches, but i try not to scratch it, i try to wear my hair loose, even when i put my hair in a bun its not pulled tight. When i brush my hair, small pieces of the scab come out, and when i wake up in the morning, my hair by the scab has pieces of it near the scalp. I dont know if i need to see a doctor or if it will go away, or what i should do about it.