Related Experiment Video
Updated: Aug 17, 2026

A Rat Model of Compound Acne
Published on: November 1, 2024
Granuloma annulare presenting as multiple nodules on the pinna
N Raghava1, J R Mitchard, R P Youngs
1Department of ENT, Gloucestershire Royal Hospital, Gloucester, UK.
Abstract:
Granuloma annulare is a benign, idiopathic, inflammatory dermatosis characterized clinically by dermal papules and annular plaques. We describe the case of a 40-year-old man who presented with a long history of multiple nodules on the left pinna. Histological examination revealed the typical necrobiotic granulomas of granuloma annulare. The condition predominantly affects the extremities of children and young adults; cases involving the pinna are extremely rare. Nodular lesions are common in otolaryngological practice, and this case illustrates the need for careful clinical assessment and appropriate biopsy in diagnosing lesions of the outer ear
Related Concept Videos
Papillary Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen and...
Atypical Pneumonia

