1. It may be caused by vitiligo. Vitiligo is a disease in which melanocytes are destroyed and white spots appear on the skin, which may lead to scalp whitening.
2. It may be caused by seborrheic dermatitis. Seborrheic dermatitis is a chronic inflammatory skin disease that occurs in the sebum overflow area, which can lead to white patches on the scalp with obvious itching symptoms.
3. It may be caused by tinea alba. Tinea albiflora generally refers to alopecia areata, which is a kind of tinea that occurs in the head. Single or multiple round irregular gray-white scales will appear on the scalp of the patient.
4. It may be caused by psoriasis. Psoriasis is a chronic squamous skin disease caused by the interaction of many factors. Erythema will appear on the scalp of the patient, which is covered with silvery white scales.
5. It may be caused by deficiency of qi and blood. Deficiency of qi and blood may cause scalp color to turn white.
Please note that the above are only the possible causes of scalp whitening, and it is recommended that you consult a professional doctor for diagnosis.