What is the diagnosis and recommended treatment for a wet, crepe‑paper‑like appearance of the external auditory canal?

Wet Crepe Paper Appearance of Ear Canal: Diagnosis and Treatment

The wet crepe paper (or "wet newspaper") appearance of the external auditory canal is pathognomonic for otomycosis caused by Aspergillus niger, and treatment requires debridement plus topical antifungal therapy—NOT topical antibiotics, which are contraindicated as they promote further fungal overgrowth. 11

Diagnosis: Otomycosis (Aspergillus niger)

The clinical description of a "wet crepe paper" or "wet newspaper" appearance is the classic presentation of Aspergillus niger infection in the external auditory canal 11. This fungal infection presents distinctly from bacterial acute otitis externa (AOE).

Key Diagnostic Features:

• Visual appearance: Moist white plug dotted with black debris, resembling wet newspaper 11
• Symptoms: Pruritus (itching) and thickened otorrhea (which may be black, gray, bluish-green, yellow, or white) 11
• Otomicroscopy: Best visualized with an otologic microscope 1

Risk Factors to Assess:

• Tropical/humid climate exposure
• Prolonged topical antibiotic use
• Diabetes mellitus
• HIV infection or immunocompromised state
• Recent treatment for bacterial otitis externa 11

Treatment Algorithm

Primary Management:

1. Debridement (essential first step)

   • Remove fungal debris from ear canal
   • Methods: gentle suction, dry mopping, or body-temperature irrigation 1
   • Adequate visualization is critical

2. Topical Antifungal Therapy

   • Primary treatment modality
   • Continue until complete resolution 11

3. Systemic Antifungal Therapy

   • Rarely needed
   • Consider only in refractory cases or immunocompromised patients 1

Critical Treatment Pitfall:

AVOID topical antibiotic therapy—this is the most important caveat. Topical antibiotics are:

• Completely ineffective against fungal infections
• Actively harmful as they promote further fungal overgrowth
• Contraindicated in otomycosis management 11

This represents a fundamental difference from bacterial AOE, where topical antibiotics are the mainstay of treatment.

Special Considerations for High-Risk Patients

Diabetic or Immunocompromised Patients:

These patients require heightened vigilance because they are susceptible to both otomycosis AND necrotizing (malignant) otitis externa, which can present similarly but requires dramatically different management 11.

Red flags requiring urgent evaluation:

• Granulation tissue at the bony-cartilaginous junction or canal floor
• Severe, disproportionate pain
• Cranial nerve involvement (especially facial nerve paralysis)
• Failure to respond to appropriate antifungal therapy

If necrotizing otitis externa is suspected:

• Obtain ESR (typically elevated)
• CT or MRI imaging 11
• Initiate systemic antibiotics covering Pseudomonas aeruginosa and MRSA
• Surgical debridement
• Do NOT irrigate the ear canal (predisposes to necrotizing otitis externa) 11

Follow-Up

Reassess in 48-72 hours for clinical improvement. If no improvement:

• Reconsider diagnosis
• Ensure adequate debridement was performed
• Verify patient adherence to antifungal therapy
• Consider systemic antifungal therapy in refractory cases
• Rule out underlying dermatologic conditions or concurrent bacterial infection