Dermatology - Papule
A papule is a medical term derived from Latin that refers to a small, raised skin lesion, commonly known as a pimple. A skin eruption characterized by little raised lesions is referred to as a papular exanthem. Papular exanthems can be classified as either "lichenoid" when they are gathered together, or "dispersed" when they are spread apart. A papule is a small, raised, firm skin lesion, often measuring less than 0.5 cm in diameter. The majority of the lesion is raised above the level of the surrounding skin, rather than being located deep within it. • Papules are rounded, cone-shaped, or raised with a flat surface that can be felt. • The elevation is caused by the accumulation of substances within the lesion, such as metabolic or locally generated deposits, localized cellular infiltrates, or inflammatory cellular components. Papules can exhibit either well-defined (sharply marginated) or ill-defined (diffuse) characteristics. Superficial papules typically have clear boundaries, while deeper dermal papules display less apparent edges.
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