(pap'ul) (Latin. Papula - a pimple)
A papule is a small solid elevation of the skin, less than 0.5 cm in diameter.
- A papule composed of localized thickening of the epidermis or of the stratum corneum.
- 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.
- A papule produced by inflammation of the dermis, epidermis or both.
- 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)