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[Retroauricular dermatitis of the "milia en plaque" type]
G Tsoïtis1, C Papadimitriou, C Asvesti
1Laboratoire d'Anatomie Pathologique de l'Université, Aristotelion de Thessalonique, Hôpital Ahepa, Grèce.
Abstract:
We report 3 cases of very rare dermatoses with retroauricular location, having lesions of "milia en plaque" type. These dermatoses are the retroauricular follicular lichen planus tumidus, the retroauricular "milia en plaque" and an exceptional case of sebocystomatosis (steatocystoma multiplex) with exclusively retroauricular location, which is unique in the literature. In this group of retroauricular dermatoses can also be included the small retention cysts and comedones of the retroauricular area, attributed to paraffin products in shaving soap inadequately rinsed from this region. On the occasion of these cases we make a review of the literature and a detailed study of the retroauricular follicular lichen planus tumidus and retroauricular milia en plaque and we discuss the differential diagnosis emphasizing the clinical and histologic features, which permit to make the accurate diagnosis.
Insights
This study details three rare retroauricular skin conditions resembling milia en plaque. It highlights follicular lichen planus tumidus, sebocystomatosis, and other cysts, emphasizing accurate diagnosis through clinical and histologic features.
Area of Science:
- Dermatology
- Pathology
Background:
- Retroauricular dermatoses are uncommon, presenting diagnostic challenges.
- Milia en plaque-type lesions in this location are particularly rare.
Observation:
- Three distinct cases of rare retroauricular dermatoses with milia en plaque-type lesions were observed.
- These included retroauricular follicular lichen planus tumidus, retroauricular milia en plaque, and a unique case of sebocystomatosis (steatocystoma multiplex).
- Other potential diagnoses include retention cysts and comedones from shaving soap residue.
Findings:
- Detailed clinical and histologic features are presented for accurate differential diagnosis.
- Retroauricular follicular lichen planus tumidus and retroauricular milia en plaque are reviewed.
- A unique case of exclusively retroauricular sebocystomatosis is documented.
Implications:
- Enhances understanding of rare retroauricular skin conditions.
- Provides diagnostic criteria for differentiating these uncommon dermatoses.
- Contributes to the literature on localized sebocystomatosis and milia en plaque variants.