What are the reasons for the purple color on the head of a child's genitalia?

Patient's question:

Not painful or itchy, just purple on the ball head

Doctor's answer:

The discoloration of the genitalia is generally caused by inflammation of the genitalia itself. This could also be due to personal hygiene habits or dietary habits. If the weather is cold, it is important to keep warm. Pay attention to personal diet and hygiene.