What is a black patch on the tip of the penis?

1, the glans

local friction, damage, can lead to glans local capillary rupture, causing blood stasis, manifested as a black block on the glans.

2, pigmented nevus

embryonic development process gene mutation, hormone levels change, immune abnormalities and other factors can cause pigmented nevus, leading to black glans block.

3, melanoma

melanoma is melanoma cells malignant tumor, can lead to black plaque on the glans, accompanied by pain, bleeding, itching, ulcers and other symptoms.