Fibrous Papule: A Histopathologic Review

Area of Science:

• Dermatopathology
• Histology
• Oncology

Background:

• Fibrous papule (FP) is a frequent benign skin lesion, predominantly on the nose.
• Dermal dendrocytes are now widely accepted as the cell of origin for FPs, resolving past controversies.
• Histopathologic diagnosis of classic FP is typically straightforward, exhibiting angiofibroma characteristics.

Purpose of the Study:

• To provide a historical overview of fibrous papule histogenesis.
• To detail the histopathologic features and diagnostic challenges of classic fibrous papules.
• To enumerate histologic variants and their differential diagnoses for accurate identification.

Main Methods:

• Literature review of fibrous papule histogenesis and pathology.
• Analysis of histopathologic features of classic fibrous papules.
• Compilation of described histologic variants and their differential diagnoses.

Main Results:

• The dermal dendrocyte is the accepted cell of origin for fibrous papules.
• Classic fibrous papules present characteristic angiofibroma-like histopathologic features.
• Several histologic variants exist, necessitating careful examination to avoid misdiagnosis.

Conclusions:

• Accurate histopathologic diagnosis of fibrous papules and their variants is crucial.
• Understanding diagnostic pitfalls prevents misclassification and inappropriate treatment.
• This review serves as a guide for dermatopathologists and clinicians managing fibrous papules.