Drug-Induced Pseudoporphyria: A Case Report

Area of Science:

• Dermatology
• Internal Medicine
• Genetics

Background:

• Pseudoporphyria is an uncommon skin disorder that clinically resembles porphyria cutanea tarda (PCT).
• Accurate diagnosis requires excluding true porphyria due to distinct pathophysiologies and normal porphyrin profiles in pseudoporphyria.
• Associated factors include chronic renal failure, hemodialysis, certain medications, and tanning bed use.

Observation:

• The case involves a 20-year-old male presenting with photosensitivity and erosions/scars on sun-exposed areas, particularly the hands and face.
• Clinical evaluation revealed no urine fluorescence under Wood's lamp, aiding in differential diagnosis.
• Symptoms of skin fragility, bullae, milia, and scarring are characteristic of pseudoporphyria.

Findings:

• The patient was diagnosed with pseudoporphyria based on clinical presentation and laboratory findings.
• Treatment initiated included hydroxychloroquine sulfate and strict ultraviolet protection.
• Drug-induced pseudoporphyria typically resolves within weeks to months after discontinuing the offending photosensitizing agent.

Implications:

• This case highlights the importance of recognizing pseudoporphyria and differentiating it from PCT.
• Management emphasizes identifying and removing causative agents (e.g., drugs, environmental exposures) and rigorous photoprotection.
• Understanding the pathophysiology, though often unknown, is crucial for effective patient care and preventing long-term scarring.