A man’s lower body turns white may be related to vitiligo, lichen planus and other diseases, the skin lesions present white spots or white reticulated striped flat papules. 1. Vitiligo is an acquired pigment deficiency disease, in the clinical mainly manifested in the skin of the white spots, can be limited onset, can also be in all parts of the body onset, in addition to affect the aesthetic, the body will not cause serious impact. Through the Wood’s lamp examination and dermatopathological examination can be clearly diagnosed, and the disease can be staged. 2. Lichen planus is a kind of chronic inflammatory skin with unknown cause, which is mainly manifested as purplish-red or multi-shaped flat papules, and white reticular stripes can also appear in the clinic. Histopathological examination can be manifested as epidermal hyperkeratosis and basal cell liquefaction degeneration. Men’s lower body white may have other reasons, it is recommended to go to the hospital in a timely manner, after a clear diagnosis, follow the doctor’s instructions for symptomatic treatment.