An abscess is a pus-filled bump or pocket that forms in or on your body due to an infection. Bacterial infections are the most common cause of abscesses, though an abscess can also form due to a viral ...

Medically reviewed by Jennifer Schwartz, MD Key Takeaways Pus forms when the immune system's white blood cells fight an infection.Pus can be different colors and may emit a foul odor if the infection ...