Recurrent Urticaria in a 6-Year-Old Child

Case at a Glance

A 6-year-old boy presents with episodic urticaria affecting the chest, abdomen, and neck area over the course of one week. The lesions appear in the evening, resolve overnight with antihistamine treatment, and recur intermittently without clear triggers.

Patient's Story

The patient's parent reports that their child began developing a rash on the belly and chest area approximately one week ago, with some spots extending to the base of the neck. The rash initially appeared and resolved spontaneously within 24 hours. Three days later, the lesions reappeared, prompting treatment with oral diphenhydramine and topical hydrocortisone cream, which resulted in complete resolution by the following morning. The parent initially suspected contact dermatitis from costume jewelry, but lesions continued to appear even after removing the potential allergen. The child denies pruritus or pain, and the lesions are not significantly warm to palpation. The patient remains systemically well with no behavioral changes. The morphology varies between urticarial wheals and papular lesions resembling insect bites, distributed across the abdomen in varying sizes and locations with each episode.

Initial Assessment

Physical examination reveals urticarial lesions on the chest and abdomen, appearing as raised, erythematous wheals of varying sizes. The patient is afebrile and shows no signs of systemic illness. No lymphadenopathy or other concerning physical findings noted. The lesions demonstrate the characteristic transient nature of urticaria, appearing in the evening and resolving by morning with treatment.

The Diagnostic Journey

The clinical presentation is consistent with acute urticaria. The parent has systematically ruled out common triggers including new foods, laundry detergents, and contact allergens. No medications, recent infections, or environmental changes were identified as potential causative factors. The episodic nature and morphology of the lesions support the diagnosis of idiopathic acute urticaria.

Final Diagnosis

Acute idiopathic urticaria

Treatment Plan

Symptomatic management with oral antihistamines (diphenhydramine) during flares and topical corticosteroids (hydrocortisone cream) for local symptom control. Referral to pediatric primary care physician for comprehensive evaluation and consideration of daily antihistamine therapy if episodes continue. Parent education regarding signs and symptoms that would warrant emergency evaluation, particularly respiratory symptoms or angioedema.

Outcome and Follow-up

The lesions continue to follow a predictable pattern of evening appearance and morning resolution with treatment. The patient remains clinically stable with no systemic symptoms. Scheduled follow-up with pediatric primary care provider for ongoing management and potential allergy evaluation if symptoms persist beyond the typical 6-week timeframe for acute urticaria.