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.
There are many causes of lumps or pain in the scrotum. Most lumps are not cancer, and many are not serious. However you should always see a doctor if you have pain, or a lump in this area. The scrotum is a loose bag of skin which hangs behind the penis in men and boys. Inside it are the two testicles (testes). The testicles make the male hormone, testosterone, and produce sperm (semen).