Hard small particles in the hair may be head lice eggs, folliculitis, ringworm and so on. 1. Head lice eggs: head lice is a kind of parasite, mainly in the hair area, this parasite will lay eggs, mainly attached to the top of the hair, manifested as small white particles. 2. Folliculitis: most folliculitis is a pathogen infection, mainly caused by Staphylococcus aureus, staphylococcus bacteria exist on the surface of the normal skin, when the skin occurs tiny trauma, this type of bacteria into the skin to cause follicle infection. The main manifestation is a red papule centered on the hair follicle, sometimes with a white pustule at the top. 3. Ringworm of the head: ringworm of the head is caused by fungal infection, which will cause a series of symptoms of the skin, appearing in clusters of small red pimples, gradually expanding in all directions to form round or oval spots of hair loss. Hard small particles in the hair may also be caused by other reasons, it is recommended that the patient to go to the hospital, clear the cause of the disease under the guidance of the doctor to deal with the symptoms, usually pay attention to keep the skin clean and hygienic.