Urticaria in infants

Overview

Urticaria, also known as hives, is a skin condition that causes raised, red, itchy bumps (wheals) that can appear suddenly and change shape or location. In infants, it can look like a patchy rash that comes and goes.

Urticaria is quite common in infants, especially mild cases that last a short time.

It can affect any infant, but it occurs more often in babies with a family history of allergies or eczema.

Symptoms

Common symptoms

• Raised, red or skin-coloured bumps (wheals) that may be itchy.
• Bumps can appear anywhere on the body and may change size or shape within hours.
• The rash may come and go, with new bumps appearing as old ones fade.

Symptoms in children

• In infants, the bumps may be less visible on darker skin tones (look for raised, warm areas).
• Babies may seem fussy, tug at their skin, or have trouble sleeping due to itching.
• Sometimes the rash is accompanied by a mild fever if caused by an infection.

Symptoms in older adults

• Urticaria in older adults is less common and may be linked to chronic conditions or medications.

Causes

Main causes

• Infections – viral illnesses like colds or stomach bugs are the most common trigger in infants.
• Food allergies – common culprits include cow’s milk, eggs, peanuts, and shellfish.
• Insect bites or stings – can cause localised hives.
• Medications – such as antibiotics or ibuprofen (but always consult a doctor before stopping any medicine).

Risk factors

• Family history of allergies, eczema, or asthma
• Previous episodes of urticaria
• Exposure to known triggers (e.g., certain foods or pollens)

When to see a doctor

See a doctor urgently if:

• If your baby has any of the emergency symptoms listed above.
• If the rash is severe, covers most of the body, or is accompanied by high fever.

Book a routine appointment if:

• If the hives last longer than a few days or keep coming back.
• If you are unsure about the cause of the rash.
• To discuss allergy testing if food triggers are suspected.

Diagnosis

Doctors usually diagnose urticaria by looking at the rash and asking about symptoms, recent illnesses, and possible triggers.

Tests that may be done

• Usually no tests are needed.
• If an allergy is suspected, the doctor may refer to a specialist for allergy testing (skin prick test or blood test).

What to expect at your appointment

The doctor will examine your baby’s skin, check for signs of infection or other conditions, and ask about any new foods, medicines, or changes in the environment. They may recommend a trial of avoiding a suspected trigger.

Treatment

Treatment focuses on relieving symptoms and avoiding triggers. Most cases do not require medication.

Self-care at home

• Keep your baby cool and dressed in loose, soft cotton clothing.
• Apply a cool, damp cloth to the itchy areas for relief.
• Avoid scratching – keep your baby’s nails short and consider using mittens.
• Oatmeal baths (using baby-safe products) can soothe the skin.

Medical treatments

If itching is severe or affecting your baby’s sleep, a doctor may recommend an infant-safe antihistamine (liquid form) for short-term use. For very severe cases, a short course of steroid medication may be prescribed. Always follow the doctor’s instructions – never give your baby any medication without medical advice.

Living with this condition

Urticaria often resolves quickly. While it lasts, keep your baby comfortable and monitor for any signs of worsening.

Lifestyle tips

• Identify and avoid known triggers, such as certain foods or soaps.
• Use fragrance-free, gentle laundry detergents and baby products.
• Maintain a cool, calm environment to reduce stress-induced flares.

Diet and exercise

For breastfed babies, mothers may try eliminating dairy or eggs under medical guidance if a food allergy is suspected. For formula-fed babies, a hypoallergenic formula may be considered only on doctor’s advice. No specific exercise restrictions for infants.

Mental health and emotional wellbeing

Seeing a rash on your baby can be stressful for parents. Remember that urticaria is usually not dangerous. If you feel anxious, talk to your healthcare provider or a support group.

Prevention

You cannot always prevent urticaria, but avoiding known triggers (such as a specific food or insect exposure) can reduce the chance of recurrence.

Vaccines

Vaccinations do not cause urticaria, but if your baby had a reaction to a previous vaccine, discuss it with your doctor before the next shot.

Complications

If left untreated

• Severe allergic reaction (anaphylaxis) – very rare, but requires emergency treatment.
• Secondary skin infection from scratching.
• Chronic urticaria (lasting more than 6 weeks) – uncommon in infants.

Long-term outlook

The outlook is excellent. Most infants with urticaria get better within a few days, and it rarely causes long-term problems. With proper management, your baby will be just fine.

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