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examination and diagnosis of pseudoacanthosis nigricans

examination and diagnosis of pseudoacanthosis nigricans


Common examination of pseudoacanthosis nigricans

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Fungal histopathologyWhole bodyDepartment of Ophthalmology and Health CareFungal histopathology...
Abdominal skin examinationSkin abdomenDepartment of Surgical Health CareAbdominal skin examination...
Clinical skin examination: The skin has a velvety appearance of dirty grayish brown or light grayish yellow, especially in armpits, neck curvature, under breast and groin. When the skin is rubbed, the papilloma-like lesions become clearer.

Pathological examination: Single bag type showed thinning and flattening of epidermis and increased pigment in basal layer; Multiple filamentous type shows hyperkeratosis of epidermis, papillomatous hyperplasia and mild to moderate hypertrophy of spinous layer. The dermis consists of loose connective tissue, fibroblasts, collagen fibers and dilated capillaries, and its changes are similar to those of fibroblastoma.

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