sudden cellulitis

Overview

Cellulitis is a bacterial skin infection that often comes on suddenly. Bacteria get into the deeper layers of your skin through a break, like a cut or an insect bite, and cause redness, swelling, and pain. It usually affects one of your legs, but it can appear anywhere on your body.

Yes, cellulitis is a common skin infection. It is one of the main reasons people need antibiotics from their doctor.

Anyone can get cellulitis, but it's more likely if you have a cut, ulcer, or broken skin; if your legs are swollen; if you have diabetes; or if your immune system is weaker because of illness or certain medications.

Symptoms

Common symptoms

• A red, swollen, tender area of skin that feels hot to touch
• The red area grows bigger over hours or days
• Pain or tenderness in the affected area
• Fever, chills, or feeling generally unwell
• Shiny, stretched-looking skin

Causes

Main causes

• Bacteria, most commonly from the 'strep' or 'staph' family, enter through a break in your skin. This could be a cut, scrape, burn, insect bite, or even cracked skin from athlete's foot or eczema.

Risk factors

• A break or crack in the skin
• Fungal infections like athlete's foot
• Leg swelling (because of circulation problems or previous surgeries)
• A weakened immune system (for example, from diabetes, chemotherapy, or HIV)
• Being very young or over 65
• Poor hygiene or exposure to dirty water

When to see a doctor

See a doctor urgently if:

• See a doctor the same day if you have a red, swollen, painful area of skin, especially if it's spreading or you have a fever. Early treatment makes a big difference.

Book a routine appointment if:

• If you have a small, non-spreading red patch that follows a minor injury, you can ask a pharmacist or practice nurse for advice. But if it gets worse, see a doctor quickly.

Diagnosis

A healthcare provider will look at your skin and ask about your symptoms and any injuries. They may gently touch the area and check how big it is. They can usually diagnose cellulitis from what they see.

Tests that may be done

• No special tests are usually needed for typical cellulitis.
• If the infection is severe or isn't getting better, they may take a blood test.
• If there is a wound or fluid, they may send a swab to a lab to find the exact bacteria.

What to expect at your appointment

The doctor will probably mark the edge of the red area with a pen so they can tell later if it's spreading. They may also check your pulse and ask about any underlying conditions. You'll get a treatment plan, usually antibiotics, and advice on what to do.

Treatment

Cellulitis is treated with antibiotics. The sooner you start them, the faster you'll recover. Mild cases are treated at home with tablets. More serious cases may need a short stay in hospital for antibiotics given through a drip (intravenously).

Self-care at home

• Rest the affected limb and keep it raised on a pillow to help reduce swelling.
• Drink plenty of fluids.
• Take pain relief exactly as your doctor or pharmacist recommends.
• Keep the skin clean and cover any open areas with a dressing.

Medical treatments

Your doctor will prescribe a course of antibiotics. It's important to take the full course, even if you start feeling better. Don't stop early. For severe infections, you may need intravenous antibiotics in the hospital for a few days.

When is surgery considered?

Surgery is rarely needed, but if an abscess (a pocket of pus) develops, a doctor may need to drain it with a small procedure.

Living with this condition

While you're on antibiotics, rest and give your body time to heal. Keep the affected area raised if possible. You'll usually notice improvement within 48 hours, but it can take a week or more to fully clear.

Lifestyle tips

• Moisturise your skin daily to prevent cracks that let bacteria in.
• Wear well-fitting socks and shoes to protect your feet.
• If you have diabetes, check your feet and legs each day for any cuts or redness.
• Trim your nails carefully and treat any fungal infections on your feet promptly.

Diet and exercise

Eating a balanced diet with plenty of vegetables and protein can help your immune system. Light activity like walking is fine, but don't exercise the infected limb until it improves. Follow your doctor's advice.

Mental health and emotional wellbeing

A sudden infection can be worrying and disruptive. It's normal to feel anxious. Talk to your doctor about any concerns, and lean on friends or family for support.

Prevention

You can't always prevent cellulitis, but you can lower your risk by keeping your skin healthy and treating any cuts quickly. Wash minor wounds with mild soap and water, apply a simple antiseptic cream or petroleum jelly, and cover with a plaster until healed.

Vaccines

There is no vaccine for cellulitis itself, but staying up to date with tetanus vaccination helps protect against complications from wounds.

Screening programmes

There is no routine screening for cellulitis, but if you have diabetes or circulation problems, regular foot checks by your healthcare team can help catch problems early.

Complications

If left untreated

• The infection can spread deeper into muscles or bones.
• Bacteria can enter the bloodstream, causing sepsis (a life-threatening emergency).
• You may develop chronic swelling in the limb (lymphoedema).
• The infection can come back again and again, causing long-term skin damage.

Long-term outlook

With prompt antibiotic treatment, most people recover completely from cellulitis. Some people with underlying health conditions may need extra time, but the outlook is very good when you get help early. If you're ever in doubt, reach out to a healthcare professional.

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