Hello, this situation may be head lice. It needs to be sealed with a towel with sulfur ointment or sulfur soap for half an hour. It may also be a cocoon worm, and this phenomenon will also occur if the hair is combed too tightly. Usually avoid eating fried, greasy, spicy, alcohol and caffeine, and eat less sweets. Because hair is alkaline and sweets are acidic, eating sweets will affect the acid-base balance in the body and easily accelerate the formation of scalp. I wish you the best of health!