Leg swelling after cellulitis: what to know

Cellulitis inflames the skin and tissues beneath it. Even after treatment starts working, local fluid drainage may remain sluggish, so the affected leg can stay swollen or feel tight. The skin should generally become less hot, painful, and red as recovery progresses. Swelling that is getting worse, redness that is spreading, or a new fever can indicate that infection is still active or has returned. A clot can also cause one-sided swelling and pain, while [Varicose Veins](/conditions/varicose-veins/) can contribute to ongoing heaviness. Swelling in both legs may have a separate cause, including [Heart Failure](/conditions/heart-failure/) or [Chronic Kidney Disease](/conditions/chronic-kidney-disease/).

Take antibiotics exactly as prescribed and complete the course unless the prescriber changes it. Keep any skin break clean, protect the area from scratching, and elevate the leg when resting if that is comfortable. Gentle movement can reduce stiffness, but avoid strenuous activity while the skin is painful or the infection is active. Marking the edge of redness can help you notice spread, although it does not replace review. Do not use compression over an acutely infected area unless your clinician has advised it. Arrange follow-up if swelling remains troublesome, the skin breaks down, or episodes keep returning.

Contact a clinician promptly if redness, warmth, tenderness, drainage, or fever returns or worsens, or if the swelling is not improving with treatment. Seek urgent help for severe pain, confusion, rapid breathing, faintness, or a rapidly spreading skin change. Sudden one-sided swelling with calf pain or breathlessness also needs urgent assessment because it may not be explained by cellulitis alone.

Ask whether the infection is responding, whether a wound or lymphatic problem is prolonging swelling, when compression is safe, and how to reduce the chance of another episode.