What Happens If Cellulitis Is Not Treated?

Cellulitis is a bacterial infection in deeper layers of skin and soft tissue. It commonly causes expanding redness, warmth, swelling and tenderness, sometimes after a cut, insect bite, ulcer or athlete's foot. Without treatment, the affected area can enlarge and infection can reach deeper tissues, lymphatic channels or the bloodstream.

A bloodstream infection can trigger sepsis, which may affect blood pressure and the function of vital organs. Cellulitis on the face can threaten structures around the eye, while infection in a person with type 2 diabetes may be harder to control when circulation or sensation is reduced.

Arrange same-day medical assessment for a warm, painful, spreading red area, especially with fever or chills. A clinician will decide whether oral or intravenous antibiotics for skin infection are needed and whether an entry point such as a wound, bite or fungal foot infection needs treatment. Keep the area clean, avoid squeezing it, and mark the edge of redness with a pen so progression can be described accurately. Do not use leftover antibiotics.

Go to urgent care immediately for rapidly spreading redness, severe pain, high fever, confusion, faintness, fast breathing, blue or mottled skin, or marked facial swelling. Emergency help is especially important when swelling is near the eye or mouth, swallowing or breathing is difficult, or you feel suddenly very unwell. These features can indicate a dangerous extension of infection or sepsis.

Where is the infection likely to have started? Which antibiotic route and duration are appropriate? What change should I expect first, and when should I return if redness or fever continues? Do I need evaluation for diabetes, a wound or athlete's foot?