I have hard and red lump on penis shaft. What could it be?

Hello,

Welcome to icliniq.com.

I went through your case and saw the attached images of the lump (attachment removed to protect patient identity). As you said this appeared suddenly and painful and the images also show marks of inflammation. This appears in its primitive examination as not a dangerous condition. But for proper diagnosis, you need to tell about any history of unprotected sexual activity, and masturbation. This history is necessary to make a proper diagnosis. So please get back to me with this history and until then keep the genital area clean and dried. Start Quadriderm cream three times a day for seven days. If this lump opens or burst please contact me as soon as possible. And stay relax and calm as this is a common condition in your age group youth due to androgen burst you may feel sometime.