Diagnosis: Nummular (discoid) eczema
A 45-year-old male construction worker presents with a 3-month history of itchy, coin-shaped plaques on the lower legs. The lesions are erythematous, scaly, and well-defined, consistent with a common form of eczema, often exacerbated by environmental factors such as dry skin and irritants encountered in his profession.
A 45-year-old male construction worker presents with a 3-month history of pruritic, coin-shaped plaques on his lower legs. On examination, multiple erythematous, scaly plaques are observed, with well-defined borders. The patient reports that the lesions are particularly bothersome after prolonged exposure to the elements during his work shifts.Location: Primarily on the lower legs, with involvement of extensor surfaces.Lesion characteristics: Coin-shaped, well-demarcated, erythematous plaques with a scaly surface.Itch: Significant pruritus reported by the patient.Chronicity: Lesions present for 3 months with gradual worsening.Exacerbating factors: Environmental exposure, including dry air and potential irritants from work.
The patient reports that the lesions began insidiously, initially appearing as small itchy spots that progressed to larger, coin-shaped plaques. He notes that the condition worsens during the winter months when his skin becomes drier. He has attempted over-the-counter moisturizers and topical hydrocortisone with minimal relief. There is no significant past medical history, and he denies any family history of atopic disease. His social history reveals daily exposure to dust and irritants at the construction site.Onset: Insidious, with worsening symptoms over the past 3 months.Triggers: Dry skin, environmental irritants, and prolonged exposure to the elements.Prior treatments: Over-the-counter moisturizers and topical hydrocortisone.Past medical history: No significant past medical history; no history of atopic dermatitis.Family history: No known family history of eczema or other atopic disorders.Social history: Works as a construction worker; daily exposure to irritants and dry conditions.
Acute / First-Line ManagementTopical corticosteroids: High-potency topical steroids (e.g., clobetasol propionate 0.05%) applied twice daily for 2-4 weeks to reduce inflammation.Moisturizers: Emollients should be applied liberally and frequently to maintain skin hydration, particularly after bathing.Antihistamines: Oral antihistamines (e.g., cetirizine 10 mg daily) can be used to manage pruritus.Workup and Diagnostic ConfirmationClinical diagnosis: Diagnosis is primarily clinical based on characteristic lesion morphology and distribution.Skin biopsy: May be considered in atypical cases or if there is concern for other dermatoses.Long-Term ManagementMaintenance therapy: Continue to use emollients regularly, especially in dry conditions.Periodic use of topical corticosteroids: Consider intermittent use of topical steroids during flare-ups.Patient education: Educate the patient on avoiding known irritants and maintaining skin hydration.Follow-up: Regular follow-up every 3-6 months to monitor the condition and adjust treatment as necessary.
Contact dermatitis: Characterized by localized lesions following exposure to an irritant or allergen; history of exposure is key for differentiation.Psoriasis: Plaques are often thicker and may have silvery scales; typically affects extensor surfaces and has a family history.Atopic dermatitis: Often has a history of atopy; lesions may be more widespread and less well-defined compared to nummular eczema.Granuloma annulare: Presents as annular plaques; lesions are usually skin-colored or erythematous and less itchy.Fungal infection (tinea corporis): Can mimic the lesions; KOH preparation or fungal culture can confirm diagnosis.Stasis dermatitis: Typically occurs in the lower extremities, often with a history of venous insufficiency; may have associated edema.Cutaneous lymphoma: May present with unusual plaques; biopsy required for definitive diagnosis.
High-Yield PearlsCoin-shaped lesions: The hallmark of nummular eczema is the presence of well-defined, coin-shaped plaques.Environmental triggers: Common exacerbating factors include dry skin and irritants found in occupational settings.Topical corticosteroids: High-potency topical corticosteroids are effective first-line treatments for inflammation.Moisturizers: Regular use of emollients is crucial in managing dryness and preventing flare-ups.Patient education: Educating patients on avoiding irritants and maintaining skin hydration is essential for long-term management.Understanding the clinical presentation and triggers of nummular eczema is key to effective management and improving patient quality of life.
Tags: nummular eczema, common