Prurigo Simplex or "Itchy Red Bump" Disease: Review and Case Series

Area of Science:

• Dermatology
• Pathology

Background:

• Prurigo simplex, also known as "itchy red bump" disease, is a poorly defined pruritic papular eruption.
• Diagnostic criteria for this condition remain controversial and require delineation.

Purpose of the Study:

• To establish clear diagnostic criteria for prurigo simplex.
• To differentiate prurigo simplex from other chronic pruritic conditions.

Main Methods:

• A comprehensive PubMed literature search was conducted using relevant keywords.
• Analysis of medical charts from patients with prurigo diagnoses in a university setting.
• Review of 32 studies involving 431 patients and detailed examination of 5 selected cases.

Main Results:

• Five patients (4 women, mean age 54) presented with persistent, intensely itchy papules for an average of 5.6 years.
• Skin biopsies showed lymphocytic perivascular infiltrates, occasional eosinophils, and spongiosis.
• Long-term treatment with methotrexate or cyclosporine resulted in symptom resolution.

Conclusions:

• Proposed major and minor diagnostic criteria for prurigo simplex are presented.
• The findings aid in distinguishing prurigo simplex from chronic prurigo.
• Effective therapeutic options include immunosuppressive agents like methotrexate and cyclosporine.