Cellulitis
A bacterial infection of the deeper layers of the skin, making it red, swollen, hot and painful.
Quick Summary
A spreading area of red, swollen, warm and painful skin, often on the leg, with fever and feeling unwell.
Antibiotics by mouth or injection, rest and raising the affected limb.
Cuts, insect bites, cracked skin, athlete's foot, diabetes, obesity and leg swelling.
Overview
Cellulitis happens when bacteria enter through a break in the skin.
It needs prompt treatment, as it can spread to the blood.
Symptoms
Red, hot skin
Spreading redness.
Swelling and pain
Tender skin.
Fever
And chills.
Spreading fast
Or with confusion: urgent care.
Causes & Risk Factors
Biological Causes
Bacteria, usually Streptococcus or Staphylococcus, entering through broken skin.
Key Risk Factors
- Skin breaks Cuts, bites and cracked heels.
- Diabetes And poor circulation.
- Leg swelling Lymphoedema.
Management & Treatment
01. Antibiotics
Such as cephalexin or amoxicillin-clavulanate.
02. Rest
Raise the limb.
03. Treat skin problems
Such as athlete's foot.
Frequently Asked Questions
Is cellulitis contagious?
Can it come back?
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Cellulitis(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Cellulitis(opens in a new tab) · NHS