The time for the spread of white spots is not determinable because the cause of the appearance of white spots varies. For example, white spots caused by pityriasis albuginea will not generally spread, while white spots caused by lichen planus, atrophic white spots on the vulva, non-pigmented nevi, vitiligo and other diseases can spread within months to years. 1, pityriasis albuginea: pityriasis albuginea is often found on the face, but can also occur on the neck, shoulders, etc. The initial stage is red, gradually turning into pale white patches, when the patient only appears a single pityriasis albuginea, in general, will not When the patient only appears a single white furuncle, usually does not appear a large area of expansion, the patient also does not appear conscious symptoms; 2, lichen planus: lichen planus can be caused by fungal infection, the lesions can be white, occasionally accompanied by itching symptoms, when improperly treated or not timely treatment, can spread to the surrounding area within a few years, but the lesion area will not be too large; 3, vulvar atrophic white spot: elderly patients can appear vulvar atrophic white spot, early only limited to the vulva, anal area The white spots can gradually spread in about 1 year; 4, anaplastic nevus: can appear at birth, can gradually expand with the development of the body, mostly in the trunk, can be scattered distribution, can not disappear naturally; 5, vitiligo: the initial stage of vitiligo can only appear spot-like white spots, after 2-5 months to spread, white patches, and 36 months are progressive, but there are some patients with a stable area of white spots There are some patients with stable white spots that do not spread. Therefore, when white spots appear, you should seek medical attention to clarify the specific cause of the disease before you can determine how long it will take for the symptoms to spread. When patients have white spots, they should actively use the appropriate way to apply drugs for treatment to avoid spreading, affecting the aesthetics and making treatment more difficult. In daily life, attention should be paid to avoid prolonged sun exposure, friction and stimulation to prevent aggravation of the skin lesions. Do a light diet, reduce the intake of stimulating food, and maintain a good state of mind.