The most common places for boils to appear are on the face, neck, armpits, shoulders, and buttocks.

Boils are usually caused by Staphylococcus aureus, which is a type of bacteria. This bacteria lives on your skin and usually doesn’t cause damage unless the skin is broken. Bacteria can enter the body through tiny cuts in the skin or damage to hair follicles, causing an infection to develop.  Boils may also be caused by other bacteria or fungi found on the skin’s surface. 

Some people are more at risk of developing boils than other individuals. People with diabetes often experience reoccurring boils, especially people over 40 years old. People with immune system disorders are also more susceptible to boils since their body has trouble fighting off infections. Those with poor hygiene are also at risk of developing boils. Bacteria that cause boils utilize natural crevices on the body that collect sweat and dead skin cells to live. In addition, individuals with poor nutrition have a decreased natural immunity and may develop boils as a result.