Scalp skin suddenly become white, consider with seborrheic dermatitis, vitiligo and other diseases related. 1. Seborrheic dermatitis: Seborrheic dermatitis is a chronic inflammatory skin disease that occurs in newborns or adults. If seborrheic dermatitis occurs in the scalp area, resulting in localized erythema flaking, itching, covered with greasy scales, can be white, showing the phenomenon of scalp whitening. 2. Vitiligo: Vitiligo is a primary, limited, generalized skin pigmentation disorder. The cause of vitiligo is not yet completely clear, can occur in any part of the body, if it occurs in the scalp, resulting in local skin color loss, white. The scalp hair white also to understand whether with insufficient nutrition, usually too much pressure, long-term sleep, endocrine disorders and other factors related. It is recommended to improve the bad dietary habits, pay attention to nutritional supplements, and go to the dermatology department of the hospital when there is any discomfort.