The glans washed with hot water whitening may be caused by vitiligo, pearly papules, poor blood circulation and other reasons. 1. Vitiligo: it is a common acquired pigment loss skin and mucous membrane disease, which may be caused by heredity, low autoimmunity and other reasons. The patient glans area can appear skin lesions, mainly manifested as milky white or porcelain white pigmentation loss spots, the border is clear. Therefore, it can cause the phenomenon of glans hot water washing over whitening. 2. Pearly papules: it may be caused by long foreskin, poor personal hygiene, coronal infection of the foreskin and other reasons. The skin lesions of the patients may appear white papules, pearly, not fused with each other, the papules are hard, so the patients may appear glans looks white after hot water washing phenomenon. 3. Poor blood circulation: may be due to varicose veins, long-term compression and other causes of poor blood circulation, there may be insufficient blood supply to the glans, resulting in ischemia, and then the glans is washed with hot water whitening phenomenon. The glans can also be seen in other reasons, it is recommended that patients go to the hospital in time, follow the doctor’s instructions for treatment, to avoid delaying the condition.