Listeria. Listeria is a bacterium that causes a serious infection called listeriosis. Around 300 deaths are caused by Listeria infection each year, according to estimates from a 2011 CDC report. Listeria bacteria are most commonly found in raw foods. Vegetables can be contaminated by soil and water carrying bacteria.
Human male reproductive system. The scrotum is the bag that holds the testicles (commonly called balls) in male mammals. It is made of skin and muscle and is found between the penis and anus. It is often covered in pubic hair and becomes tight when the male is aroused.
A number of disorders can result in a scrotal mass or an abnormality in the scrotum, including: 1  Testicular cancer. 2  Testicular cancer is a tumor containing abnormal testicular tissue, which can usually be felt as a lump in the scrotum.