Darkening on the foreskin of the penis may be normal or abnormal. First, certain normal people may experience darkening of the penis and scrotum, usually as a result of melanin deposition, or long-term use of steroidal hormonal medications. Secondly, the phenomenon of darkening of the penile foreskin in certain populations may also be due to healing lesions left over from their previous genital-related diseases, such as genital herpes, fungal infections of the penis, scabies, etc., which manifest as dark spots. Again, certain groups of people may be abnormal, such as those suffering from serious liver and kidney diseases, such as cirrhosis and renal insufficiency, which can lead to an increase in toxic substances in the blood, which can cause toxic deposits on the skin of the penis and symptoms such as darkening and itching of the foreskin. Other people have black spots above the foreskin of the penis, which may suggest melanoma. The appearance of blackness on the foreskin should be seen in hospital in time to avoid delaying the condition.