Most infected piercings are caused by which organism?

• A. Streptococcus Pyogenes
• B. Escherichia Coli
• C. Staphylococcus Aureus
• D. Pseudomonas Aeruginosa

Answer: (C)

Infections at piercing sites most commonly come from the skin’s own bacteria, especially Staphylococcus aureus. This organism is a frequent resident on the skin and in the nose, and when a piercing creates a break in the skin barrier, S. aureus readily invades and can form pus, leading to a localized infection such as redness, warmth, swelling, and sometimes an abscess. While other bacteria can cause infections—like Streptococcus species in some skin infections, or Gram-negative organisms from contamination or water exposure—the pattern most often seen with piercings is Staphylococcus aureus. This is why treatments for piercing infections frequently target Staph aureus, with consideration for MRSA if risk factors are present.