White spots on the hair break when pulled may be caused by lice eggs, ringworm, seborrheic dermatitis, folliculitis and other factors. 1. Lice eggs: if there are lice eggs on the hair, there may be white granules, irregularly arranged adhering to the hair, more at the root of the hair, there will be lice at the same time, but the color of the adult lice is similar to the color of the hair, it is not easy to find, often accompanied by itching. 2. Tinea capitis: it is a fungal infection of the scalp, white or grayish-white patches can be seen at the lesions, the damaged hairs are easily broken at a distance of 2-3 cm from the scalp, and sheath-like white scales can be seen at the roots of the diseased hairs. 3. Seborrheic dermatitis: commonly found on the scalp, face and other parts of the sebaceous gland secretion, manifested as erythema, flaking, itching and other symptoms, shedding of dandruff adhering to the hair can be manifested as white spots. 4. Folliculitis: can occur in any part of the body with hair follicles, manifested as red papules around the hair follicles, accompanied by red, swollen, hot, painful inflammatory reaction, parts of the folliculitis may appear in the center of the pus, manifested as small white spots. Hair with white spots on the pull on the break may also be due to other factors, it is recommended that patients seek medical attention in a timely manner, in order to clarify the diagnosis, symptomatic treatment.