Diagnosis: Eczema herpeticum (Kaposi varicelliform eruption)
A 10-year-old male with a history of atopic dermatitis presented with painful, monomorphic punched-out erosions. These lesions developed following a recent upper respiratory infection, leading to significant discomfort and concern for secondary infection.
A 10-year-old male presented with painful, monomorphic punched-out erosions on his face and trunk, which developed over the course of three days. The patient had a known history of atopic dermatitis, with lesions that were erythematous and crusted, accompanied by pruritus and discomfort.Lesion morphology: Monomorphic punched-out erosions with a crusted appearance.Distribution: Primarily on the face and trunk.Associated symptoms: Significant pruritus and pain.Systemic signs: Mild fever and malaise noted prior to the eruption.Skin type: Patient has a background of dry, atopic skin.
The patient reported that the lesions began approximately three days after experiencing symptoms of an upper respiratory infection, including fever and malaise. He has a history of atopic dermatitis managed with topical corticosteroids and emollients. No previous episodes of similar lesions were reported, and he has no history of herpes simplex virus infections. Family history is significant for atopic dermatitis in both parents. The patient lives in a household with a younger sibling who has recurrent cold sores.Onset: Rapid onset following upper respiratory infection.Triggers: Recent infection and associated stress.Prior treatments: Topical corticosteroids and emollients.Past medical history: Atopic dermatitis, no history of HSV infection.Family history: Atopic dermatitis in both parents.Social history: Lives with a sibling who has recurrent herpes labialis.
Acute / First-Line ManagementInitiate oral antiviral therapy with acyclovir 400 mg TID for 5-10 days or valacyclovir 1 g TID for 5 days.Supportive care including analgesics for pain management and topical antiseptics for secondary infection prevention.Consider short courses of systemic corticosteroids (e.g., prednisone 1 mg/kg/day) if significant inflammation is present.Workup and Diagnostic ConfirmationClinical diagnosis based on characteristic appearance and history.Consider viral swab for polymerase chain reaction (PCR) testing if atypical features are present.Serologic testing for HSV may be considered in recurrent cases.Long-Term ManagementEducate the patient on the importance of avoiding known triggers, including stress and skin barrier disruption.Implement a comprehensive skincare regimen with frequent use of emollients.Consider prophylactic antivirals for patients with recurrent episodes, particularly if HSV is isolated.Regular follow-up to monitor for recurrent infections and manage atopic dermatitis effectively.
Impetigo: Superficial bacterial skin infection characterized by honey-colored crusts; usually associated with pruritus and localized erythema.Herpes simplex virus infection: Vesicular lesions that may rupture to form painful erosions; history of recurrent cold sores can aid in differentiation.Contact dermatitis: Erythematous, itchy patches that may develop into vesicles; often linked to exposure to irritants or allergens.Varicella zoster virus (VZV) infection: Typically presents with a vesicular rash; history of exposure or vaccination status can help in diagnosis.Staphylococcal scalded skin syndrome: Presents with widespread blistering and erosions, often in children; associated with systemic signs of infection.Viral exanthem: Generalized rash associated with systemic viral infections; often accompanied by fever and malaise.Folliculitis: Inflammation of hair follicles that can present as pustules or erosions; typically localized and may be itchy.Other viral exanthems: Such as hand-foot-mouth disease, which may present with erosive lesions but often has distinctive lesions on palms and soles.
High-Yield PearlsHistory: A thorough history of atopic dermatitis and recent infections is crucial for diagnosis.Clinical presentation: Monomorphic punched-out erosions are characteristic of herpes simplex virus infections in patients with atopic dermatitis.Antiviral therapy: Early initiation of antiviral therapy is essential to prevent complications and promote healing.Education: Patient education on skin care and infection prevention can significantly reduce recurrence.Prophylaxis: Consider prophylactic antiviral therapy in patients with frequent recurrences to minimize outbreaks.In patients with atopic dermatitis, any new vesicular or erosive lesions should prompt consideration of eczema herpeticum.
Tags: eczema herpeticum, HSV