Cellulitis is a bacterial skin infection that parents across Robbinsville, Bordentown, Allentown, and Hamilton Township sometimes dismiss as a minor rash — only to find it spreading rapidly. Knowing how to recognize cellulitis and understanding when it requires urgent medical attention can make a real difference for your child's health.

What Is Cellulitis?

Cellulitis is an infection of the deeper layers of the skin and the tissue just beneath it. It is caused by bacteria — most commonly Staphylococcus aureus (staph) or Streptococcus (strep) — that enter the body through a break in the skin.

Unlike a superficial scrape or rash, cellulitis involves an active bacterial infection spreading through the skin tissue, which is why prompt recognition and treatment are important.

How Cellulitis Starts

A cut, scrape, or puncture wound
An insect bite (mosquito, tick, or bee sting)
A skin condition like eczema or athlete's foot that creates cracks
Chickenpox blisters
A surgical wound or IV site
A hangnail or torn cuticle

Sometimes there's no obvious wound — bacteria can enter through very small breaks invisible to the naked eye.

Symptoms to Watch For

Early Symptoms

Redness in an area of skin, often with a defined border
Warmth — the affected skin feels noticeably warmer than surrounding skin
Swelling and puffiness in the area
Tenderness or pain when touching the skin
The skin may appear pink to bright red

Signs the Infection Is Spreading or Worsening

Redness that is expanding or spreading — you can mark the border with a pen to track
Red streaks extending outward from the infected area (a sign bacteria are entering the lymphatic system)
Fever (any temperature above 100.4°F / 38°C)
Increasing swelling, warmth, or pain
Pus or fluid draining from the skin
Blistering within the red area
Your child feels increasingly unwell, fatigued, or ill

Home Care for Mild Cellulitis

Very mild cases of cellulitis — small area, no fever, not spreading — in an otherwise healthy older child may sometimes be managed at home with close monitoring and oral antibiotics prescribed by your pediatrician. If your doctor prescribes antibiotics:

Give every dose on schedule and complete the full course (usually 5–10 days)
Rest and elevate the affected limb if possible (elevation reduces swelling)
Apply a cool, damp cloth to reduce discomfort
Mark the edge of the redness with a pen so you can monitor spread
Check back with your pediatrician if the redness spreads past the line within 24–48 hours

When to Go to Urgent Care or the ER

Your child has a fever along with cellulitis signs
The redness is spreading rapidly (several centimeters over a few hours)
There are red streaks radiating from the area
The skin has blistered or is turning dark/purple
Your infant or young baby has any signs of cellulitis (they can deteriorate quickly)
Your child appears very unwell, is shaking, or seems disoriented
Cellulitis involves the face, especially near the eye — this requires emergency evaluation

Facial cellulitis near the eye (periorbital or orbital cellulitis) is a medical emergency. If your child's eyelid or skin around the eye is red, swollen, and warm, go to the ER immediately.

Treatment for Cellulitis

Most cases of cellulitis are treated with antibiotics. Mild cases in older children may be treated with oral antibiotics at home. More severe cases, or those in young infants, may require IV antibiotics in the hospital.

Your child should begin to improve within 24–48 hours of starting antibiotics. If symptoms are not improving after 2–3 days of antibiotic treatment, call our office or return to the ER.

When to Call Hummingbird Pediatrics

Your child has redness, warmth, and swelling around a wound or insect bite
You're unsure whether symptoms warrant urgent care
Symptoms aren't improving 48 hours after starting antibiotics

When in doubt, call. Early treatment of cellulitis is always better than waiting.

Cellulitis in Children: Symptoms, Home Care, and When to Go to the ER