A small white spot on the corpus cavernosum usually refers to a small white spot on the skin of the penis, which may be caused by sebaceous ectasia, pearly penile papules, vitiligo and other reasons. 1. Sebaceous gland ectasia: hormonal secretion stimulation during pubertal development, external stimulation or trauma and other related. The manifestation of the pinhead size, isolated, slightly elevated, yellowish-white pimples. 2. pearly penile papules: caused by various reasons of penile pearly papules, in the coronal groove of the pinpoint or corn-like large pimples. 3. Vitiligo: Vitiligo is an acquired pigment loss skin and mucous membrane disease, clinical manifestations of white spots, can occur in all parts of the body, may be in the spongy body will have white dots on the performance. There are other causes of a small white spot on the sponge, it is recommended to go to the hospital in time, identify the cause and treatment.