Cellulitis in infants

Overview

Cellulitis is a bacterial infection of the deeper layers of the skin. In infants, it can be serious and needs prompt medical care.

Cellulitis is not very common in infants, but it can happen, especially if the baby has a skin injury or a weak immune system.

It can affect any infant, but is more likely in babies under 6 months old, those with eczema, or those with a recent skin wound.

Symptoms

Common symptoms

• Redness and swelling on the skin that spreads quickly
• Warmth in the affected area
• Pain or tenderness when touched

Symptoms in children

• Fever
• Irritability or fussiness more than usual
• Pulling away when the sore area is touched
• Lack of appetite or poor feeding

Causes

Main causes

• Bacteria (most commonly Streptococcus or Staphylococcus) entering the skin through a break, like a scratch, insect bite, or dry skin
• In some cases, no clear break is found – the bacteria may come from the baby's own skin or nose

Risk factors

• Eczema or other skin conditions that make the skin dry and cracked
• Recent surgery or medical procedure on the skin
• Weak immune system (e.g., from premature birth or a chronic illness)
• Living in crowded or unhygienic conditions
• Being bitten by an animal or insect

When to see a doctor

See a doctor urgently if:

• If you notice any redness, swelling, or warmth on your baby’s skin, even if mild
• If the baby has a fever along with a skin change
• If the baby seems unwell, fussy, or is feeding less

Diagnosis

A doctor will examine your baby’s skin and ask about symptoms. They will look for redness, swelling, warmth, and tenderness.

Tests that may be done

• Sometimes a blood test to check for infection
• If there is a wound, a sample (swab) may be sent to the lab to find out which bacteria is causing it
• Very rarely, imaging (like an ultrasound) to see how deep the infection goes

What to expect at your appointment

The doctor will likely start antibiotics quickly. If the infection is mild, your baby may be treated at home with oral antibiotics. If it is severe or your baby is very young, they may need to be admitted to hospital for intravenous (IV) antibiotics.

Treatment

Treatment for infant cellulitis focuses on killing the bacteria and stopping the infection from spreading. Antibiotics are the main treatment.

Self-care at home

• Keep the affected area clean and dry – follow your doctor's advice on bathing
• If the infection is on a limb, you can gently lift the area (elevate) to reduce swelling, if your doctor says it's safe
• Monitor the redness: draw a line around it with a pen to see if it is growing – tell your doctor if it spreads
• Give your baby plenty of fluids (breast milk or formula) and let them rest

Medical treatments

Most babies are given oral antibiotics for 5-10 days. For more serious infections, or if the baby is under 3 months old, they may need intravenous (IV) antibiotics in hospital. The doctor will choose an antibiotic that is safe for infants. Do not give any over-the-counter creams or medicines without consulting a doctor.

When is surgery considered?

Surgery is rarely needed, but if there is a pocket of pus (abscess), a doctor may need to drain it.

Living with this condition

Look after your baby's skin: keep it clean and moisturised if they have dry skin. Check for any new redness or swelling daily. Follow the full course of antibiotics as prescribed, even if your baby seems better.

Lifestyle tips

• Keep your baby's fingernails short to reduce scratching
• Avoid using harsh soaps or bubble baths that can dry the skin
• Keep all cuts, bites, or scratches covered with a clean plaster until healed
• Wash your hands before and after touching the infected area

Diet and exercise

Babies do not need special food or exercise. Ensure they get enough breast milk or formula and have normal nappy output. Rest is important for recovery.

Mental health and emotional wellbeing

Seeing your baby unwell can be very stressful. It is normal to feel anxious. Talk to your healthcare provider about your worries, and ask family members for support.

Prevention

You cannot always prevent cellulitis, but you can lower the risk by caring for your baby's skin and treating any breaks quickly.

Vaccines

Some vaccines (like the pneumococcal vaccine) may reduce the risk of certain bacterial infections that can lead to cellulitis. Follow the recommended vaccination schedule for your baby.

Screening programmes

There is no routine screening for cellulitis. But watch for early signs, especially if your baby has eczema or a recent skin injury.

Complications

If left untreated

• The infection can spread to deeper tissues (like muscle or bone)
• It can enter the bloodstream (sepsis), which is life-threatening
• Scarring or skin changes in the affected area
• Repeated infections if the underlying cause (like eczema) is not managed

Long-term outlook

With prompt treatment, almost all infants recover fully from cellulitis without long-term problems. The key is to get medical help early, finish the prescribed antibiotics, and watch for any signs that the infection is getting worse.

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