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Scrotal Eczema: Causes, Diagnosis, and Treatment Options

Scrotal Eczema: Diagnosis and Management

Scrotal eczema (scrotal dermatitis) is a common inflammatory condition affecting the scrotal skin. The thin, highly vascular, elastic scrotal skin with abundant apocrine glands and frequent occlusion creates unique susceptibility to irritation, allergy, and secondary infection.

Etiology and Risk Factors

  • Atopic dermatitis: Personal/family history of atopy; often part of generalized AD
  • Contact dermatitis (allergic/irritant):
    • Allergic: fragrances, preservatives, lanolin, rubber accelerators (condoms, elastic), topical medications (neomycin, corticosteroids)
    • Irritant: soaps, detergents, urine, sweat, friction, over-cleansing
  • Seborrheic dermatitis: Malassezia-driven; greasy scaling on erythematous base; often involves groin, perianal area
  • Psoriasis (inverse): Well-demarcated, glazed erythema without scale; Koebnerization
  • Fungal (tinea cruris): Annular, active border; KOH prep confirms
  • Lichen simplex chronicus: Lichenification from chronic scratching
  • Drug reactions: Fixed drug eruption, systemic contact dermatitis
  • Extramammary Paget's disease: Rare; persistent erythematous plaque; biopsy if refractory

Clinical Features

  • Intense pruritus (often nocturnal)
  • Erythema, edema, scaling, fissuring
  • Lichenification with chronicity
  • Burning, stinging, pain (especially with fissures/infection)
  • Secondary infection: pustules, crusting, cellulitis

Diagnostic Approach

  1. Detailed history: products, fabrics, lubricants, condoms, topical meds, occupational exposures
  2. Full skin exam (assess for generalized AD, psoriasis, fungal)
  3. KOH prep for fungus
  4. Patch testing (NACDG + textile/medicament series) for suspected contact allergy
  5. Biopsy if diagnosis uncertain or refractory

Treatment

General Measures

  • Gentle cleansing: lukewarm water, fragrance-free non-soap cleanser or water alone
  • Pat dry; air-dry briefly
  • Fragrance-free barrier ointment (petrolatum, zinc oxide) after each void/bath
  • Loose, 100% cotton underwear; avoid synthetic, tight, elastic-waist
  • Laundry: fragrance/dye-free detergent; double rinse; no fabric softener

Topical Therapy

  • Mild: Hydrocortisone 1–2.5% ointment × 1–2 weeks, then weekend maintenance
  • Moderate: TCIs (tacrolimus 0.03%, pimecrolimus 1%) preferred for thin skin—no atrophy risk; can use long-term
  • Seborrheic component: Ketoconazole 2% cream, ciclopirox
  • Fungal: Topical terbinafine/ketoconazole × 2–4 weeks
  • Infected: Add topical mupirocin or oral antibiotic (cephalexin)

Severe/Refractory

  • Short-course mid-potency TCS (triamcinolone 0.1%) × 1 week → step down
  • Phototherapy (NB-UVB) for widespread genital involvement
  • Systemic agents (per AD guidelines) if part of severe generalized disease

Pruritus Control

  • Sedating antihistamine at night (hydroxyzine, diphenhydramine)
  • Gabapentin/pregabalin for neuropathic itch component
  • Cool compresses, oatmeal baths

Red Flags: Refer to Dermatology/Urology

  • Non-healing ulcer, nodule, or indurated plaque
  • Pigmented lesion (melanoma)
  • Refractory despite 4–6 weeks appropriate therapy
  • Suspected contact allergy requiring patch testing
  • Significant quality-of-life impact

Scrotal eczema is highly treatable. Accurate diagnosis, irritant elimination, barrier restoration, and appropriate anti-inflammatory therapy—respecting the unique anatomy—restore comfort and confidence.

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