Leaving an abscess untreated can lead to a number of complications, including: ⊕ Spread of infection: The infection can travel through the bloodstream and infect other parts of the body. ⊕ Cellulitis: This is a serious skin infection that can cause redness, swelling, and pain. ⊕ Sepsis: This is a life-threatening condition that occurs when the body’s response to infection injures its own tissues and organs.