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Papule (definition)
(pap'ul) (Latin. Papula - a pimple)
A papule is a small solid elevation of the skin, less than 0.5 cm in diameter.
Epidermal papule:
- A papule composed of localized thickening of the epidermis or of the stratum corneum.
Dermal papule:
- A papule composed of a localized, solid thickening of the dermis produced by augmentation of normal structures, deposition of metabolic products, concentrations of cells or other pathologic changes.
Inflammatory papule:
- A papule produced by inflammation of the dermis, epidermis or both.
Papulosquamous lesion:
- A papule that develops a reactive or degenerative epithelial component resulting in desquamation, which is the loss of epithelial cells or of stratum corneum (scaling).
(from the ILDS Committee on Nomenclature - R. Winkelmann, Chairman)
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