Cholestatic Pruritus Mimicking a Cutaneous Drug Eruption

Area of Science:

• Internal Medicine
• Dermatology
• Gastroenterology

Background:

• Pruritus, or itch, is a common symptom with diverse causes, including skin conditions and systemic diseases.
• Itch is categorized into neuropathic, neurogenic/systemic, psychogenic, and pruritoceptive based on its origin.
• Accurate classification is crucial for effective management and identifying underlying pathologies.

Observation:

• An 83-year-old male presented with generalized pruritus and a trunk rash.
• The eruption featured excoriated papules and began after starting meloxicam, resembling a drug reaction.
• The patient's symptoms were ultimately linked to cholestasis caused by bile duct cancer.

Findings:

• The patient's pruritus and rash were secondary to cholestasis from bile duct malignancy.
• Atypical presentation mimicked a cutaneous adverse drug reaction, delaying diagnosis.
• Systemic causes should be investigated in patients with unexplained pruritus and skin lesions.

Implications:

• This case underscores the need to consider systemic diseases, such as malignancy-induced cholestasis, in patients with atypical pruritus.
• Differentiating systemic pruritus from cutaneous causes is vital for appropriate patient care.
• Early identification of systemic etiologies can lead to timely treatment and improved outcomes.