White granules on the foreskin may be caused by sebaceous ectasia, folliculitis, warts and other factors. 1. sebaceous ectasia: skin trauma, skin localized by frequent stimulation, may cause sebaceous ectasia, will make the presence of white particles on the scalp, particles independent scattered distribution, the surface is relatively smooth, most of the self-conscious symptoms. 2. Folliculitis: men often do not wash the foreskin, may lead to local hair follicle infection, induced folliculitis, elevated white particles within the purulent secretion, accompanied by itching and swelling pain. 3. warts: men have unclean sex, caused by warts, will make the foreskin there is a white or reddish white particles, the shape of the vegetable pattern, can gradually increase, and has a strong contagious. The white particles on the foreskin and other discomforts, it is recommended that men seek medical examination and treatment.