###Human: I have swollen and discolored penis. What is it? ###Assistant: Hi. I have reviewed all the attached photographs (attachment removed to protect patient identity). I can appreciate slight color change of the glans. It can be pre-vitiligo, but it is too early to be absolutely sure. I would recommend you to keep a watch on it whether the color changes to more white or it spreads further. Presently, I do not think it needs any treatment, but you keep it under observation. As far as meatus is concerned, it is slightly red. Since, there are no symptoms and all your tests are negative, you do not have to worry. You do not have to be anxious as it is not looking like any sexually transmitted disease. For further information consult a dermatologist online -->