Rhodamin B Stain for Keratin: Evaluation of its Specificity and its Application in Dermal Pathology

Abstract
Rhodamin B stain was used in sections of normal skin [scalp, trunk, upper arm, palmar, plantar], benign and malignant epithelial tumors [inverted follicular keratosis, warty dyskeratoma, verruca vulgaris, epidermoid cyst, seborrheic verruca, keratoacanthoma, organoid nevus, proliferating trichilemmal cyst, actinic keratosis, squamous cell carcinoma, extramammary Paget disease] and dermatoses [lichen planus, incontinentia pigmenti, Darier disease]. Keratin staining was uneven and showed variation in different lesions. Trichohyalin of the anagen hair follicle stained intensely; keratohyalin granules failed to show a similar reaction.

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