A fistula is an abnormal channel that connects two internal structures or an internal structure to the skin. This page gives general information about common signs, possible causes, and which medical specialties typically evaluate fistulas. If you notice rapidly worsening pain, high fever, spreading redness, or uncontrolled bleeding, seek urgent medical care.
A fistula forms when an unexpected channel develops between two normally separate tissues. Common types include anal fistulas, enterocutaneous (gut-to-skin) fistulas, and pilonidal fistulas. Some are associated with chronic drainage or recurrent infections. Symptoms and implications vary with location and underlying cause.
Signs often include persistent or intermittent drainage from the skin, local redness, tenderness, discomfort around the site, and sometimes a foul smell. Seek urgent evaluation for high fever, rapidly spreading redness, severe pain, or heavy bleeding. For non-urgent new or mild symptoms, start with a primary care clinician for assessment and referral.
Fistulas can arise after an abscess that didn’t fully heal, following surgery or trauma, or from long-standing inflammatory conditions such as Crohn’s disease. Diabetes, immune suppression, and recurrent local infections may increase risk. Determining the likely cause usually requires a medical history, exam, and sometimes targeted tests.
Evaluation typically begins with a physical exam; imaging (ultrasound, MRI) or specialized studies may be used to map a tract. Referral depends on location: anal or bowel-related fistulas are usually managed by General Surgery or Gastroenterology; skin-origin fistulas by Dermatology; infections by Infectious Diseases specialists. Primary care (Family Medicine) is often the first point of contact for triage and referral.
Maintain local hygiene, protect the area from irritation, and keep scheduled follow-ups. Report increases in pain, fever, expanding redness, or heavier drainage to a health professional. People with chronic inflammatory conditions or weakened immunity may need closer monitoring and earlier assessment.
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