Chronic generalized pruritus without primary skin lesions: a longitudinal prospective observational study

Area of Science:

• Dermatology
• Internal Medicine
• Endocrinology

Background:

• Pruritus is a common dermatological complaint.
• Chronic pruritus (CP) lasting over 6 weeks signals potential systemic issues.
• Identifying underlying causes is crucial for managing CP without primary skin lesions.

Purpose of the Study:

• To investigate the prevalence and characteristics of generalized pruritus without primary skin lesions.
• To identify common systemic diseases associated with this condition.
• To determine if patient demographics correlate with underlying causes.

Main Methods:

• Prospective analysis of 49 patients with generalized pruritus and no primary skin lesions.
• Patients underwent initial evaluations and 12-18 month follow-ups.
• Statistical analysis of demographic data and underlying diseases.

Main Results:

• 50% of patients had a systemic cause for their pruritus.
• Most common causes included thyroid disorders (16.67%), diabetes mellitus (12.5%), and malignancy (8.33%).
• Women experienced earlier onset of pruritus by 12 years on average (P=0.011).

Conclusions:

• Endocrine disorders and malignancies are frequent underlying causes of chronic pruritus without primary skin lesions.
• Routine screening for these conditions is recommended for patients presenting with unexplained generalized pruritus.
• Further research into sex-specific differences in pruritus onset is warranted.