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

Black masses on the glans penis may be caused by trauma, pigmented nevus, melanoma, etc.

1.

Friction and damage to the glans penis caused by trauma can lead to rupture of local capillaries in the glans penis, causing blood stasis, manifested as black masses on the glans penis.

2.

Gene mutations, changes in hormone levels, immune abnormalities and other factors during embryonic development of pigmented nevus can cause pigmented nevus, resulting in black masses on the glans penis.

3. Melanoma

Melanoma is a tumor caused by malignant transformation of melanocytes, which can cause black plaques on the glans penis, accompanied by pain, bleeding, itching, ulcers and other symptoms.