Nummular Eczema

Nummular eczema is a chronic, inflammatory skin condition characterized by the formation of coin-shaped (nummular) pruritic, erythematous plaques. It primarily affects the extremities and trunk and is often exacerbated by environmental factors and xerosis (dry skin).

The exact etiology remains idiopathic. Contributing factors include barrier disruption, skin trauma (Koebner phenomenon), xerosis, contact sensitivity (metals/chemicals), and microbial colonization (Staphylococcus aureus).

Pathophysiology involves epidermal barrier dysfunction leading to increased transepidermal water loss. Chronic inflammation occurs through T-cell mediated pathways, causing cytokine release (IL-4, IL-13) that induces pruritus and vascular dilation in the dermis.

Bimodal distribution: primarily seen in young adults (males) and elderly individuals (females). It is more prevalent in temperate climates during winter months due to lower humidity.

Xerosis, atopic dermatitis history, skin injury, contact dermatitis, stress, and medications (e.g., isotretinoin, interferon).

A. Early Symptoms

• Small, red papules or vesicles


• Intense pruritus


• Localized skin dryness B. Common Symptoms


• Well-demarcated coin-shaped plaques


• Erythema


• Scaling or crusting C. Advanced Symptoms


• Lichenification


• Exudative (weeping) lesions


• Secondary bacterial infection (honey-colored crusting) D. Emergency Symptoms


• Signs of cellulitis (spreading erythema, heat, systemic fever)

Inspection reveals erythematous, circular plaques typically 1–10 cm in diameter. Palpation identifies dry, scaly surfaces; plaques may be firm or exudative if secondary infection is present.

A. Clinical Assessment: Based on lesion morphology and distribution.
B. Laboratory Testing: Swab for bacterial culture if infection is suspected.
C. Imaging Studies: None required.
D. Functional Tests: Patch testing if contact dermatitis is suspected.
E. Biopsy Findings: Spongiosis, parakeratosis, and dermal lymphocytic infiltration.
F. Genetic Testing: Not indicated.
G. Differential Diagnosis: Tinea corporis, psoriasis, contact dermatitis.

Bacterial Culture
Type: Skin Swab
Purpose: Rule out S. aureus colonization.
Expected Findings: Growth of pathogens.
Interpretation: Positive results warrant antibiotic therapy.

None typically required for diagnosis.

Tinea corporis (ringworm) is the primary mimic; fungal scrapings (KOH test) differentiate them. Psoriasis presents with silvery scales and extensor surface involvement.

Secondary bacterial infections, lichen simplex chronicus (from chronic scratching), post-inflammatory hyperpigmentation.

A. Lifestyle Modifications: Lukewarm baths, application of emollients, humidifier usage.
B. Preventive Measures: Avoid harsh soaps, minimize skin trauma, moisturize daily.
C. Medical Treatment:

• Topical Corticosteroids: Reduce inflammation (e.g., Clobetasol, Triamcinolone).


• Topical Calcineurin Inhibitors: Pimecrolimus, Tacrolimus.


• Systemic Antibiotics: For secondary infections (e.g., Cephalexin).

Chronic but manageable. Recurrences are common. Long-term outcomes are generally favorable with diligent skin care.

Maintenance of skin hydration, avoidance of triggers, prompt treatment of minor skin injuries.

The following homeopathic remedies have been historically indicated for symptoms associated with Nummular Eczema. Selection should be based on individualized symptom totality and constitutional assessment.

• Homeopathy by Hadhrat Mirza Tahir Ahmad (r.a.) — Primary clinical reference
• Robin Murphy — Lotus Materia Medica (3rd Edition)
• William Boericke — Pocket Manual of Homœopathic Materia Medica & Repertory
• ICD-10/ICD-11 Classification — World Health Organization
• Harrison's Principles of Internal Medicine (Reference Standard)

This clinical reference profile is compiled from authoritative medical sources for educational purposes. Always verify clinical data with current medical guidelines.

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